diff --git a/README.md b/README.md
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+# tetris
diff --git a/assets/background.png b/assets/background.png
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diff --git a/assets/blocks.png b/assets/blocks.png
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diff --git a/assets/clear.wav b/assets/clear.wav
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diff --git a/assets/fall.wav b/assets/fall.wav
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diff --git a/assets/gameover.png b/assets/gameover.png
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diff --git a/assets/gameover.wav b/assets/gameover.wav
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diff --git a/assets/line.wav b/assets/line.wav
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diff --git a/assets/menuselect.wav b/assets/menuselect.wav
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diff --git a/assets/success.wav b/assets/success.wav
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diff --git a/assets/tetris_theme.ogg b/assets/tetris_theme.ogg
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diff --git a/main.py b/main.py
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+
+import sys, random
+import sdl2, sdl2.ext, sdl2.sdlmixer
+
+ROWS = 20
+COLS = 10
+
+TETROMINOS = [
+    [[1, 0, 0, 0],
+     [1, 1, 0, 0],
+     [0, 1, 0, 0],
+     [0, 0, 0, 0]],
+    [[1, 0, 0, 0],
+     [1, 0, 0, 0],
+     [1, 1, 0, 0],
+     [0, 0, 0, 0]],
+    [[1, 0, 0, 0],
+     [1, 1, 0, 0],
+     [1, 0, 0, 0],
+     [0, 0, 0, 0]],
+    [[1, 1, 0, 0],
+     [1, 1, 0, 0],
+     [0, 0, 0, 0],
+     [0, 0, 0, 0]],
+    [[1, 0, 0, 0],
+     [1, 0, 0, 0],
+     [1, 0, 0, 0],
+     [1, 0, 0, 0]],
+]
+
+class Tetromino:
+    def __init__(self, table):
+        self.table = table
+        self.x = COLS // 2 - 1
+        self.y = 0
+        self.color = random.randrange(7)
+        i = random.randrange(len(TETROMINOS))
+        self.data = TETROMINOS[i]
+        if i < 2 and random.random() > 0.5:
+            self.data = [[l[1], l[0], 0, 0] for l in self.data]
+
+    def can_place(self, px, py, d=None):
+        if not d:
+            d = self.data
+        for y in range(4):
+            for x in range(4):
+                ix, iy = x + px, y + py
+                if d[y][x] and (iy < 0 or iy >= ROWS or ix < 0 or ix >= COLS or self.table[iy][ix] >= 0):
+                    return False
+        return True
+
+    def rotate(self):
+        d = [l for l in self.data]
+        while d[3] == [0, 0, 0, 0]:
+            d.insert(0, d.pop())
+
+        d = [[d[3 - x][y] for x in range(4)] for y in range(4)]
+        if self.can_place(self.x, self.y, d):
+            self.data = d
+        elif self.can_place(self.x - 1, self.y, d):
+            self.x-= 1
+            self.data = d
+
+    def place(self):
+        for y in range(4):
+            for x in range(4):
+                if self.data[y][x]:
+                    self.table[self.y + y][self.x + x] = self.color
+
+    def move(self, dx, dy):
+        if self.can_place(self.x + dx, self.y + dy):
+            self.x+= dx
+            self.y+= dy
+            return True
+        return False
+
+class TetrisApp:
+    sfx = {}
+
+    def __init__(self):
+        sdl2.ext.init()
+        sdl2.sdlmixer.Mix_OpenAudio(44100, sdl2.sdlmixer.MIX_DEFAULT_FORMAT, 2, 1024)
+        window = sdl2.ext.Window("Tetris", size=(528, 672), flags=sdl2.SDL_WINDOW_BORDERLESS | sdl2.SDL_WINDOW_ALLOW_HIGHDPI)
+        window.show()
+        self.renderer = sdl2.ext.Renderer(window)
+
+        self.music = sdl2.sdlmixer.Mix_LoadMUS(b"assets/tetris_theme.ogg")
+
+    def _play(self, name):
+        sfx = self.sfx.get(name, None)
+        if not sfx:
+            self.sfx[name] = sfx = sdl2.sdlmixer.Mix_LoadWAV(f"assets/{name}.wav".encode())
+        sdl2.sdlmixer.Mix_PlayChannel(-1, sfx, 0)
+
+    def run(self):
+        sdl2.sdlmixer.Mix_PlayMusic(self.music, -1)
+
+        background_tex = sdl2.ext.Texture(self.renderer, sdl2.ext.load_image(b"assets/background.png"))
+        blocks_tex = sdl2.ext.Texture(self.renderer, sdl2.ext.load_image(b"assets/blocks.png"))
+        gameover_tex = sdl2.ext.Texture(self.renderer, sdl2.ext.load_image(b"assets/gameover.png"))
+        def draw(x, y, c):
+            self.renderer.blit(
+                blocks_tex,
+                srcrect=(c * 32, 0, 32, 32),
+                dstrect=((x + 0.5) * 32, (y + 0.5) * 32)
+            )
+
+        table = [[-1 for _ in range(COLS)] for _ in range(ROWS)]
+        current, next = None, Tetromino(table)
+        timer, speed = 0, 300
+        scan_x, scan_y = None, None
+        running, gameover = True, False
+        while running:
+            if not current and not gameover:
+                if not next.can_place(next.x, next.y):
+                    gameover = True
+                    sdl2.sdlmixer.Mix_PauseMusic()
+                    self._play("gameover")
+                else:
+                    current = next
+                    next = Tetromino(table)
+
+            self.renderer.blit(background_tex)
+            for y in range(ROWS):
+                for x in range(COLS):
+                    c = table[y][x]
+                    if c >= 0:
+                        draw(x, y, c)
+            if current:
+                for y in range(4):
+                    for x in range(4):
+                        if current.data[y][x]:
+                            draw(current.x + x, current.y + y, current.color)
+            if next:
+                for y in range(4):
+                    for x in range(4):
+                        if next.data[y][x]:
+                            draw(x + 12, y + 0.5, next.color)
+            if gameover:
+                self.renderer.blit(gameover_tex)
+
+            for e in sdl2.ext.get_events():
+                if e.type == sdl2.SDL_QUIT:
+                    running = False
+                elif e.type == sdl2.SDL_KEYDOWN and e.key.keysym.sym == sdl2.SDLK_ESCAPE:
+                    running = False
+                elif current and not gameover and e.type == sdl2.SDL_KEYDOWN:
+                    k = e.key.keysym.sym
+                    if k == sdl2.SDLK_j:
+                        current.move(0, 1)
+                    elif k == sdl2.SDLK_h:
+                        current.move(-1, 0)
+                    elif k == sdl2.SDLK_l:
+                        current.move(1, 0)
+                    elif k == sdl2.SDLK_k:
+                        current.rotate()
+                elif gameover and e.type == sdl2.SDL_KEYDOWN and e.key.keysym.sym == sdl2.SDLK_SPACE:
+                    for y in range(ROWS):
+                        for x in range(COLS):
+                            table[y][x] = -1
+                    gameover = False
+                    sdl2.sdlmixer.Mix_PlayMusic(self.music, -1)
+
+            self.renderer.present()
+            sdl2.SDL_Delay(16)
+
+            if scan_x != None:
+                if scan_x < COLS:
+                    for y in scan_y:
+                        table[y][scan_x] = -1
+                    scan_x+= 1
+                else:
+                    scan_x = None
+                    for y in scan_y:
+                        for x in range(COLS):
+                            for ty in range(y, 0, -1):
+                                table[ty][x] = table[ty - 1][x]
+
+            timer+= 16
+            if current and timer >= speed:
+                timer = 0
+                if not current.move(0, 1):
+                    current.place()
+                    self._play("fall")
+                    scan_y = []
+                    for y in range(current.y, current.y + 4):
+                        if y >= ROWS:
+                            continue
+                        found = True
+                        for x in range(COLS):
+                            if table[y][x] < 0:
+                                found = False
+                                break
+                        if found:
+                            for x in range(0, COLS):
+                                table[y][x] = 7
+                            scan_y.append(y)
+                            if scan_x == None:
+                                self._play("line")
+                            scan_x = 0
+                    current = None
+
+        return 0
+
+if __name__ == "__main__":
+    sys.exit(TetrisApp().run())
+