diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..4fa3689
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,21 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.22000.0",
+            "compilerPath": "C:/mingw64/bin/gcc.exe",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-gcc-x64"
+        }
+    ],
+    "version": 4
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..3aef1c1
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,11 @@
+{
+    "files.associations": {
+        "compare": "c",
+        "concepts": "c",
+        "cstdlib": "c",
+        "type_traits": "c",
+        "cmath": "c",
+        "limits": "c",
+        "new": "c"
+    }
+}
\ No newline at end of file
diff --git a/build.py b/build.py
index 3cbd166..21802c3 100644
--- a/build.py
+++ b/build.py
@@ -11,7 +11,7 @@ ARGS = "-fdiagnostics-color -pthread -Wall -std=c17 -pedantic -g"
 
 SOURCE_DIR = Path("source/")
 OBJECT_DIR = Path("objects/")
-OUTPUT = Path("build/debug")
+OUTPUT = Path("debug")
 
 
 SRC_CHECKSUMS_TXT = Path("build/src_checksums.txt")
diff --git a/build/debug.exe b/build/debug.exe
deleted file mode 100644
index eda6b15..0000000
Binary files a/build/debug.exe and /dev/null differ
diff --git a/build/errors.txt b/build/errors.txt
index 9dde9e6..c099047 100644
--- a/build/errors.txt
+++ b/build/errors.txt
@@ -1 +1 @@
-{"tetr": "", "ringbuffer": "", "event": "", "ctrl": "", "terminal": "", "fumoengine": "", "parseinput": "", "dictionary": "", "fumocommon": "", "win": "", "input": "", "fumotris": "", "vector": ""}
\ No newline at end of file
+{"ringbuffer": "", "event": "", "ctrl": "", "terminal": "", "fumoengine": "", "parseinput": "", "dictionary": "", "fumocommon": "", "win": "", "input": "", "fumotris": "", "vector": "", "tetra": ""}
\ No newline at end of file
diff --git a/build/hdr_checksums.txt b/build/hdr_checksums.txt
index ed1b7c8..37d3502 100644
--- a/build/hdr_checksums.txt
+++ b/build/hdr_checksums.txt
@@ -1 +1 @@
-["0d7597ffd48812c52d3f02731cbf693f", "6669fc7fcffc77563f1315cb7710ec82", "fbccab3d5cd1838cbf8ad1d4e2a7c03b", "1d6bdf7e8de4ac751252b67027e5d57e", "330b6f9493d091e7c340c1434b6f80b4", "a3dca3fbce775b791384bec8abc3f0c3", "f61af2abe56cd6881a830ae6222483e9", "1cdcae043579aa6406b9823b5f52aedd", "088145536b04ef82517eb93630888dff", "1420f33d62a8ed8429c8f1a96f1ab33e", "e38bd5ea2b554a21849158242a2add8e", "9df90eabc8908cac60aa774d335a106c", "333c7211bb2c72ad321495f53d11bff0", "dc6df72158812bc9f6ed484a4cfb046b"]
\ No newline at end of file
+["1d6bdf7e8de4ac751252b67027e5d57e", "9df90eabc8908cac60aa774d335a106c", "1420f33d62a8ed8429c8f1a96f1ab33e", "dc6df72158812bc9f6ed484a4cfb046b", "6669fc7fcffc77563f1315cb7710ec82", "333c7211bb2c72ad321495f53d11bff0", "088145536b04ef82517eb93630888dff", "f61af2abe56cd6881a830ae6222483e9", "e09059d1f20c982c6c42a61a0754c102", "fbccab3d5cd1838cbf8ad1d4e2a7c03b", "330b6f9493d091e7c340c1434b6f80b4", "e38bd5ea2b554a21849158242a2add8e"]
\ No newline at end of file
diff --git a/debug.exe b/debug.exe
new file mode 100644
index 0000000..dda63fa
Binary files /dev/null and b/debug.exe differ
diff --git a/objects/ctrl.o b/objects/ctrl.o
index 25339a9..9638d8e 100644
Binary files a/objects/ctrl.o and b/objects/ctrl.o differ
diff --git a/objects/dictionary.o b/objects/dictionary.o
index 763d6d4..5aa83ba 100644
Binary files a/objects/dictionary.o and b/objects/dictionary.o differ
diff --git a/objects/event.o b/objects/event.o
index 95dd92c..68654a0 100644
Binary files a/objects/event.o and b/objects/event.o differ
diff --git a/objects/fumocommon.o b/objects/fumocommon.o
index ce43889..bb3f424 100644
Binary files a/objects/fumocommon.o and b/objects/fumocommon.o differ
diff --git a/objects/fumoengine.o b/objects/fumoengine.o
index 71fbb76..9b15b8a 100644
Binary files a/objects/fumoengine.o and b/objects/fumoengine.o differ
diff --git a/objects/fumotris.o b/objects/fumotris.o
index 479d292..3268eb1 100644
Binary files a/objects/fumotris.o and b/objects/fumotris.o differ
diff --git a/objects/input.o b/objects/input.o
index 481c498..b9a14eb 100644
Binary files a/objects/input.o and b/objects/input.o differ
diff --git a/objects/parseinput.o b/objects/parseinput.o
index d82f6db..3353ca8 100644
Binary files a/objects/parseinput.o and b/objects/parseinput.o differ
diff --git a/objects/ringbuffer.o b/objects/ringbuffer.o
index 0c42d27..550bf82 100644
Binary files a/objects/ringbuffer.o and b/objects/ringbuffer.o differ
diff --git a/objects/terminal.o b/objects/terminal.o
index 15f1c79..7c54a21 100644
Binary files a/objects/terminal.o and b/objects/terminal.o differ
diff --git a/objects/tetr.o b/objects/tetr.o
index 4966281..df3f43e 100644
Binary files a/objects/tetr.o and b/objects/tetr.o differ
diff --git a/objects/tetra.o b/objects/tetra.o
new file mode 100644
index 0000000..871a9ab
Binary files /dev/null and b/objects/tetra.o differ
diff --git a/objects/vector.o b/objects/vector.o
index 573ad7c..932cde8 100644
Binary files a/objects/vector.o and b/objects/vector.o differ
diff --git a/objects/win.o b/objects/win.o
index 97ef881..f9b8c56 100644
Binary files a/objects/win.o and b/objects/win.o differ
diff --git a/source/fumoengine/fumocommon.h b/source/fumoengine/fumocommon.h
index f1739d6..132da2e 100644
--- a/source/fumoengine/fumocommon.h
+++ b/source/fumoengine/fumocommon.h
@@ -9,7 +9,6 @@
 
 
 typedef size_t          usize;
-typedef ptrdiff_t       isize;
 
 
 typedef uint8_t         u8;
diff --git a/source/fumoengine/fumoengine.c b/source/fumoengine/fumoengine.c
index 72c6e69..1217379 100644
--- a/source/fumoengine/fumoengine.c
+++ b/source/fumoengine/fumoengine.c
@@ -51,8 +51,9 @@ bool FumoInstanceRun(struct FumoInstance *inst)
 
         nsec now = TimeNow();
         inst->frametime = now - inst->time;
-        EventInvoke(&inst->on_update, inst);
         inst->time = now;
+        
+        EventInvoke(&inst->on_update, inst);
 
         TerminalPrint(&inst->term, buf, buf_n);
         puts(buf);
diff --git a/source/fumoengine/include/dictionary.c b/source/fumoengine/include/dictionary.c
index 7f63491..2e69e08 100644
--- a/source/fumoengine/include/dictionary.c
+++ b/source/fumoengine/include/dictionary.c
@@ -1,4 +1,5 @@
 #include "dictionary.h"
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -74,7 +75,11 @@ void *DictionaryFind(DictT T, struct Dictionary *dict, u32 key)
 {
     usize index = key % dict->capacity;
 
-    return probe_bkt(T, dict, index, key);
+    void *bkt = probe_bkt(T, dict, index, key);
+    if (bkt == nullptr)
+        return false;
+
+    return get_val(T, bkt);
 }
 
 void *DictionarySet(DictT T, struct Dictionary *dict, u32 key, void *val)
@@ -82,6 +87,7 @@ void *DictionarySet(DictT T, struct Dictionary *dict, u32 key, void *val)
     usize index = key % dict->capacity;
 
     void *bkt = probe_empty_bkt(T, dict, index, key);
+
     if (*get_key(T, bkt) == 0) 
         set_bkt(T, bkt, key, val);
 
diff --git a/source/fumoengine/input/ctrl.c b/source/fumoengine/input/ctrl.c
index deba581..fba729f 100644
--- a/source/fumoengine/input/ctrl.c
+++ b/source/fumoengine/input/ctrl.c
@@ -10,18 +10,15 @@ DictT BIND_T = DICT_T(struct InputAxis *);
 bool CreateController(struct Controller *ctrl)
 {
     struct InputAxis *axes = calloc(16, sizeof(struct InputAxis));
-
     if (axes == nullptr)
         return false;
 
     if (!CreateDictionary(BIND_T, &ctrl->binds))
         return false;
 
-    *ctrl = (struct Controller) {
-        .pending_len = 0,
-        .axes = axes,
-        .axes_len = 0
-    };
+    ctrl->pending_len = 0;
+    ctrl->axes = axes;
+    ctrl->axes_len = 0;
 
     return true;
 }
@@ -42,13 +39,11 @@ bool ControllerBind(struct Controller *ctrl, u16 control, u16 code, u16 type)
     u32 hash = hash_bind(code, type);
 
     struct InputAxis *axis = &ctrl->axes[control];
-    struct InputAxis **bind = DictionarySet(BIND_T, &ctrl->binds, hash, axis);
+    struct InputAxis **bind = DictionarySet(BIND_T, &ctrl->binds, hash, &axis);
     
     if (bind == nullptr)
         return false;
 
-    *bind = axis;
-
     return true;
 }
 
@@ -97,13 +92,13 @@ void ControllerPoll(struct Controller *ctrl, struct RecordBuffer *recs)
         struct InputRecord *rec = recs->buf + i;
         
         u32 hash = hash_bind(rec->code, rec->type);
-        struct InputAxis *axis = DictionaryFind(BIND_T, &ctrl->binds, hash);
+        struct InputAxis **axis = DictionaryFind(BIND_T, &ctrl->binds, hash);
 
         if (axis == nullptr)
             continue;
 
-        dispatch_update(axis, rec);
-        ctrl->pending[ctrl->pending_len++] = axis;
+        dispatch_update(*axis, rec);
+        ctrl->pending[ctrl->pending_len++] = *axis;
     }
 
     recs->head.len = 0;
diff --git a/source/fumoengine/terminal/terminal.c b/source/fumoengine/terminal/terminal.c
index ddae341..3ae0e8b 100644
--- a/source/fumoengine/terminal/terminal.c
+++ b/source/fumoengine/terminal/terminal.c
@@ -114,9 +114,9 @@ usize TerminalPrint(struct Terminal *term, char *out, usize n)
     usize len = 7;
     memcpy(out, "\x1b[H\x1b[0m", 7);
 
+    usize i = 0;
     for (usize y = 0; y < term->hgt; y++) {
-    for (usize x = 0; x < term->wid; x++) {
-        usize i = y * term->wid + x;
+    for (usize x = 0; x < term->wid; x++, i++) {
         struct Char4 *ch4 = &term->buf[i];
 
         // DEBUG
diff --git a/source/fumotris/fumotris.c b/source/fumotris/fumotris.c
index ef7cfcc..3a91d4b 100644
--- a/source/fumotris/fumotris.c
+++ b/source/fumotris/fumotris.c
@@ -2,36 +2,69 @@
 
 
 struct Fumotris {
-    struct TetrMap board;
-    struct TetrMap piece;
+    struct Tetra board;
+    struct Tetra piece;
+    nsec timer;
+    bool is_ground;
 };
 
 
-void FumotrisStart(void *inst_arg, void *game_arg)
+void FumotrisStart(struct FumoInstance *inst, struct Fumotris *fumo)
 {
-    struct FumoInstance *inst = inst_arg;
-    struct Fumotris *game = game_arg;
-
     ControllerBindMulti(&inst->ctrl, BINDS_N, controls_g, codes_g, types_g);
 
-    CreateTetrMap(&game->board, 10, 10);
-    CreateTetrMap(&game->piece, 3, 3);
-    game->piece.blks = T;
+    CreateTetra(&fumo->board, 10, 10);
+    SetTetra(&fumo->piece, T, 3, 3, 0, 0);
+    fumo->timer = 0;
+    fumo->is_ground = false;
 }
 
-void FumotrisUpdate(void *inst_arg, void *game_arg)
+void FumotrisUpdate(struct FumoInstance *inst, struct Fumotris *fumo)
 {
-    struct FumoInstance *inst = inst_arg;
-    struct Fumotris *game = game_arg;
-
+    i16 horizontal = 0;
     if (inst->ctrl.axes[LEFT].is_down)
-        game->piece.x -= 1;
-        
+        horizontal -= 1;
     if (inst->ctrl.axes[RIGHT].is_down)
-        game->piece.x += 1;
+        horizontal += 1;
+    TetraMove(&fumo->piece, &fumo->board, horizontal, 0);
 
-    TetrMapDraw(&game->board, &inst->term);
-    TetrMapDraw(&game->piece, &inst->term);
+
+    if (inst->ctrl.axes[SOFT_DROP].is_down)
+        TetraMove(&fumo->piece, &fumo->board, 0, 1);
+        
+        
+    if (inst->ctrl.axes[HARD_DROP].is_down) {
+        while (TetraMove(&fumo->piece, &fumo->board, 0, 1));
+        
+        fumo->timer = 0;
+        TetraOverlay(&fumo->piece, &fumo->board);
+        SetTetra(&fumo->piece, I, 4, 4, 0, 0);
+
+        return;
+    }
+
+    fumo->timer += inst->frametime;
+    while (fumo->timer > 5e8) {
+        fumo->timer -= 5e8;
+
+        if (!TetraMove(&fumo->piece, &fumo->board, 0, 1)) {
+            if (!fumo->is_ground) {
+                fumo->is_ground = true;
+            } else {
+                TetraOverlay(&fumo->piece, &fumo->board);
+                SetTetra(&fumo->piece, I, 4, 4, 0, 0);
+
+                fumo->is_ground = false;
+            }
+        }
+    }
+}
+
+void FumotrisDraw(struct FumoInstance *inst, struct Fumotris *fumo)
+{
+    TetraTerminalClear(&fumo->board, &inst->term);
+    TetraTerminalDraw(&fumo->board, &inst->term);
+    TetraTerminalDraw(&fumo->piece, &inst->term);
 }
 
 int main()
diff --git a/source/fumotris/fumotris.h b/source/fumotris/fumotris.h
index de2d6f8..9b5a9e2 100644
--- a/source/fumotris/fumotris.h
+++ b/source/fumotris/fumotris.h
@@ -1,6 +1,6 @@
 #include "fumocommon.h"
 #include "fumoengine.h"
-#include "tetr.h"
+#include "tetra.h"
 
 #define BINDS_N 12
 
@@ -22,6 +22,12 @@ enum FumotrisControls {
     MOUSE
 };
 
+struct TetraTemplate {
+    u8 *blks;
+    u16 wid;
+    u16 hgt;
+};
+
 
 u16 controls_g[BINDS_N] = {
     LEFT,
@@ -74,44 +80,72 @@ u16 types_g[BINDS_N] = {
     JOYSTICK
 };
 
-u8 I[16] = {
-    0, 0, 0, 0,
-    0, 0, 0, 0,
-    1, 1, 1, 1,
-    0, 0, 0, 0
+struct TetraTemplate I = {
+    .blks = &(u8) {
+        0, 0, 0, 0,
+        0, 0, 0, 0,
+        1, 1, 1, 1,
+        0, 0, 0, 0
+    },
+    .wid = 4,
+    .hgt = 4
 };
 
-u8 O[4] = {
-    1, 1,
-    1, 1
+struct TetraTemplate O = {
+    .blks = &(u8) {
+        1, 1,
+        1, 1
+    },
+    .wid = 2,
+    .hgt = 2
 };
 
-u8 T[9] = {
-    0, 1, 0,
-    1, 1, 1,
-    0, 0, 0
+struct TetraTemplate T = {
+    .blks = &(u8) {
+        0, 1, 0,
+        1, 1, 1,
+        0, 0, 0
+    },
+    .wid = 3,
+    .hgt = 3
 };
 
-u8 S[9] = {
-    0, 1, 1,
-    1, 1, 0,
-    0, 0, 0
+struct TetraTemplate S = {
+    .blks = &(u8) {
+        0, 1, 1,
+        1, 1, 0,
+        0, 0, 0
+    },
+    .wid = 3,
+    .hgt = 3
 };
 
-u8 Z[9] = {
-    1, 1, 0,
-    0, 1, 1,
-    0, 0, 0
+struct TetraTemplate Z = {
+    .blks = &(u8) {
+        1, 1, 0,
+        0, 1, 1,
+        0, 0, 0
+    },
+    .wid = 3,
+    .hgt = 3
 };
 
-u8 J[9] = {
-    1, 0, 0,
-    1, 1, 1,
-    0, 0, 0
+struct TetraTemplate J = {
+    .blks = &(u8) {
+        1, 0, 0,
+        1, 1, 1,
+        0, 0, 0
+    },
+    .wid = 3,
+    .hgt = 3
 };
 
-u8 L[9] = {
-    0, 0, 1,
-    1, 1, 1,
-    0, 0, 0
+struct TetraTemplate L = {
+    .blks = &(u8) {
+        0, 0, 1,
+        1, 1, 1,
+        0, 0, 0
+    },
+    .wid = 3,
+    .hgt = 3
 };
\ No newline at end of file
diff --git a/source/fumotris/tetr.c b/source/fumotris/tetr.c
deleted file mode 100644
index e9c514f..0000000
--- a/source/fumotris/tetr.c
+++ /dev/null
@@ -1,77 +0,0 @@
-#include "tetr.h"
-
-
-bool CreateTetrMap(struct TetrMap *map, usize wid, usize hgt)
-{
-    u8 *blks = calloc(wid * hgt, sizeof(u8));
-    
-    if (blks == nullptr)
-        return false;
-
-    *map = (struct TetrMap) {
-        .wid = wid,
-        .hgt = hgt,
-
-        .x = 0,
-        .y = 0,
-
-        .rot = 0,
-
-        .blks = blks
-    };
-
-    return true;
-}
-
-void FreeTetrMap(struct TetrMap *map)
-{
-    free(map->blks);
-}
-
-void TetrMapDraw(struct TetrMap *map, struct Terminal *term)
-{
-    static const u8f blk_colors[8] = { 8, 14, 11, 13, 10, 9, 12, 3 };
-
-    for (usize y = 0; y < map->hgt; y++) {
-    for (usize x = 0; x < map->wid; x++) {
-        usize map_i = y * map->wid + x;
-        usize term_i = (y + map->y) * term->wid + (x + map->x) * 2;
-
-        struct Char4 *block = term->buf + term_i;
-
-        if (map->blks[map_i] == 0) {
-            block[0].ch = '(';
-            block[1].ch = ')';
-        } else {
-            block[0].ch = '[';
-            block[1].ch = ']';
-        }
-
-        u8 fg = blk_colors[map->blks[map_i]];
-        block[0].color.fg = fg;
-        block[1].color.fg = fg;
-    }
-    }
-}
-
-bool TetrCollisionCheck(struct TetrMap *board, struct TetrMap *piece, int dx, int dy)
-{
-    size_t i = 0;
-    for (size_t y = piece->y + dy; y < piece->y + piece->hgt + dy; y++) {
-    for (size_t x = piece->x + dx; x < piece->x + piece->wid + dx; x++) {
-        if(piece->blks[i] == 0)
-            goto next;
-
-        if(y >= board->hgt or x >= board->wid)
-            return false;
-
-        size_t board_i = y * board->wid + x;
-        if(board->blks[board_i] != 0)
-            return false;
-
-next:
-        i++;
-    }
-    }
-    return true;
-}
\ No newline at end of file
diff --git a/source/fumotris/tetr.h b/source/fumotris/tetr.h
deleted file mode 100644
index 419f990..0000000
--- a/source/fumotris/tetr.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "fumocommon.h"
-#include "terminal.h"
-
-
-struct TetrMap {
-    usize wid;
-    usize hgt;
-
-    int x;
-    int y;
-
-    u8f rot;
-
-    u8 *blks;
-};
-
-bool CreateTetrMap(struct TetrMap *map, usize wid, usize hgt);
-
-void FreeTetrMap(struct TetrMap *map);
-
-void TetrMapDraw(struct TetrMap *map, struct Terminal *term);
-
-bool TetrCollisionCheck(struct TetrMap *board, struct TetrMap *piece, int dx, int dy);
\ No newline at end of file
diff --git a/source/fumotris/tetra.c b/source/fumotris/tetra.c
new file mode 100644
index 0000000..cd823fc
--- /dev/null
+++ b/source/fumotris/tetra.c
@@ -0,0 +1,115 @@
+#include "tetra.h"
+
+
+bool CreateTetra(struct Tetra *map, u16 wid, u16 hgt)
+{
+    u8 *blks = calloc(wid * hgt, sizeof(u8));
+    
+    if (blks == nullptr)
+        return false;
+
+    map->blks = blks;
+    map->wid = wid;
+    map->hgt = hgt;
+
+    map->x = 0;
+    map->y = 0;
+    map->rot = 0;
+
+    return true;
+}
+
+void FreeTetra(struct Tetra *tetra)
+{
+    free(tetra->blks);
+}
+
+void SetTetra(struct Tetra *map, u8 *blks, u16 wid, u16 hgt, i16 x, i16 y)
+{
+    map->blks = blks;
+    map->wid = wid;
+    map->hgt = hgt;
+    
+    map->x = x;
+    map->y = y;
+    map->rot = 0;
+}
+
+bool TetraMove(struct Tetra *piece, struct Tetra *board, i16 dx, i16 dy)
+{
+    if (TetraIsCollision(piece, board, dx, dy))
+        return false;
+
+    piece->x += dx;
+    piece->y += dy;
+
+    return true;
+}
+
+bool TetraIsCollision(struct Tetra *piece, struct Tetra *board, i16 dx, i16 dy)
+{
+    i16 x_start = piece->x + dx;
+    i16 y_start = piece->y + dy;
+
+    usize i = 0;
+    for (i16 y = y_start; y < y_start + piece->hgt; y++) {
+    for (i16 x = x_start; x < x_start + piece->wid; x++, i++) {
+        if(piece->blks[i] == 0)
+            continue;
+
+        if(x < 0 or x >= board->wid or y < 0 or y >= board->hgt)
+            return true;
+
+        if(board->blks[board->wid * y + x] != 0)
+            return true;
+    }
+    }
+
+    return false;
+}
+
+void TetraTerminalClear(struct Tetra *board, struct Terminal *term)
+{
+    for (usize i = 0; i < board->wid * board->hgt; i++) {
+        struct Char4 *block = term->buf + i * 2;
+
+        block[0] = (struct Char4) { .ch = '(', .color.fg = 8 };
+        block[1] = (struct Char4) { .ch = ')', .color.fg = 8 };
+    }
+}
+
+void TetraTerminalDraw(struct Tetra *tetra, struct Terminal *term)
+{
+    static const u8f blk_colors[8] = { 8, 14, 11, 13, 10, 9, 12, 3 };
+
+    usize i = 0;
+    for (usize y = 0; y < tetra->hgt; y++) {
+    for (usize x = 0; x < tetra->wid; x++, i++) {
+        if (tetra->blks[i] == 0)
+            continue;
+
+        usize term_i = (y + tetra->y) * term->wid + (x + tetra->x) * 2;
+        struct Char4 *block = term->buf + term_i;
+        
+        u8 fg = blk_colors[tetra->blks[i]];
+        block[0] = (struct Char4) { .ch = '[', .color.fg = fg };
+        block[1] = (struct Char4) { .ch = ']', .color.fg = fg };
+    }
+    }
+}
+
+void TetraOverlay(struct Tetra *piece, struct Tetra *board)
+{
+    usize i = 0;
+    for (usize y = piece->y; y < piece->y + piece->hgt; y++) {
+    for (usize x = piece->x; x < piece->x + piece->wid; x++, i++) {
+        if(piece->blks[i] == 0)
+            continue;
+
+        if(x < 0 or x >= board->wid or y < 0 or y >= board->hgt)
+            continue;
+
+        board->blks[board->wid * y + x] = piece->blks[i];
+    }
+    }
+}
\ No newline at end of file
diff --git a/source/fumotris/tetra.h b/source/fumotris/tetra.h
new file mode 100644
index 0000000..800bbd3
--- /dev/null
+++ b/source/fumotris/tetra.h
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "fumocommon.h"
+#include "terminal.h"
+
+
+struct Tetra {
+    u8 *blks;
+
+    u16 wid;
+    u16 hgt;
+
+    i16 x;
+    i16 y;
+
+    u8f rot;
+};
+
+bool CreateTetra(struct Tetra *map, u16 wid, u16 hgt);
+
+void FreeTetra(struct Tetra *map);
+
+void SetTetra(struct Tetra *map, u8 *blks, u16 wid, u16 hgt, i16 x, i16 y);
+
+void TetraTerminalClear(struct Tetra *board, struct Terminal *term);
+
+void TetraTerminalDraw(struct Tetra *map, struct Terminal *term);
+
+bool TetraMove(struct Tetra *piece, struct Tetra *board, i16 dx, i16 dy);
+
+bool TetraIsCollision(struct Tetra *piece, struct Tetra *board, i16 dx, i16 dy);
+
+void TetraOverlay(struct Tetra *piece, struct Tetra *board);
\ No newline at end of file