diff --git a/tetris.py b/tetris.py
new file mode 100644
index 0000000..4f4bb23
--- /dev/null
+++ b/tetris.py
@@ -0,0 +1,162 @@
+import curses
+import time
+
+import numpy as np
+
+PIECES = {
+    "O": np.array([[1, 1], [1, 1]]),  # 2x2 block
+    "I": np.array([[1, 1, 1, 1]]),  # 4x1 horizontal bar
+    "L": np.array([[1, 0], [1, 0], [1, 1]]),  # L-shaped
+}
+
+
+def check_placement(piece, board, i, j):
+    """Check if a piece can be placed on the board. Return True if possible, False otherwise."""
+    n, m = piece.shape
+    if i + n > board.shape[0] or j + m > board.shape[1]:
+        return False  # Out of bounds
+    for x in range(n):
+        for y in range(m):
+            if piece[x, y] == 1 and board[i + x, j + y] == 1:
+                return False
+    return True
+
+
+def place_piece(piece, board, i, j):
+    """Place a piece on the board at the specified position."""
+    board[i : i + piece.shape[0], j : j + piece.shape[1]] += piece
+    return board
+
+
+def attempt_rotate(piece, board, i, j):
+    """Attempt to rotate a piece."""
+    rotated_piece = np.rot90(piece)
+    if check_placement(rotated_piece, board, i, j):
+        return rotated_piece
+    return piece
+
+
+def clear_rows(board):
+    """Clear completed rows from the board."""
+    clear_indices = np.where(np.all(board == 1, axis=1))[0]
+    if clear_indices.size > 0:
+        board = np.delete(board, clear_indices, axis=0)
+        new_rows = np.zeros((len(clear_indices), board.shape[1]))
+        board = np.vstack([new_rows, board])
+    return board
+
+
+def calculate_shadow(piece, board, i, j):
+    """Calculate the shadow position for the current piece."""
+    while check_placement(piece, board, i + 1, j):
+        i += 1
+    return i
+
+
+def display_board(stdscr, board, piece, i, j):
+    """Display the board and the piece."""
+    stdscr.clear()
+    shadow_i = calculate_shadow(piece, board, i, j)
+    n, m = piece.shape
+    for y in range(board.shape[0]):
+        for x in range(board.shape[1]):
+            char = " "  # Default background
+            if (
+                y >= shadow_i
+                and y < shadow_i + n
+                and x >= j
+                and x < j + m
+                and piece[y - shadow_i, x - j]
+            ):
+                char = "*"  # Shadow
+            elif y >= i and y < i + n and x >= j and x < j + m and piece[y - i, x - j]:
+                char = "#"  # Piece
+            elif board[y, x]:
+                char = "#"  # Static pieces
+            stdscr.addstr(y, x * 2, char)
+    stdscr.refresh()
+
+
+def main(stdscr):
+    curses.curs_set(0)
+    stdscr.nodelay(True)
+    stdscr.keypad(True)
+
+    board = np.zeros((20, 10), dtype=int)
+    piece_types = list(PIECES.keys())
+    current_piece = PIECES[np.random.choice(piece_types)]
+    START_POS = (0, 4)
+    i, j = START_POS
+    auto_gravity = True
+    fall_rate = 0.5  # Seconds between falls
+
+    # Initial instruction
+    stdscr.addstr(
+        22,
+        0,
+        "Press SPACE to start. Use keys (a=left, d=right, s=down, w=rotate, S=drop, G=toggle gravity, Q=quit):",
+    )
+    while stdscr.getch() != ord(" "):
+        pass
+
+    last_fall_time = time.time()
+
+    while True:
+        display_board(stdscr, board, current_piece, i, j)
+
+        if not check_placement(current_piece, board, *START_POS):
+            stdscr.addstr(22, 0, "GAME OVER! Press any key to exit.")
+            stdscr.getch()
+            break
+
+        # Handle key inputs
+        key = stdscr.getch()
+        if key == ord("q"):
+            break
+        elif (
+            key == ord("a")
+            and j > 0
+            and check_placement(current_piece, board, i, j - 1)
+        ):
+            j -= 1
+        elif (
+            key == ord("d")
+            and j + current_piece.shape[1] < board.shape[1]
+            and check_placement(current_piece, board, i, j + 1)
+        ):
+            j += 1
+        elif key == ord("w"):
+            new_piece = attempt_rotate(current_piece, board, i, j)
+            if check_placement(new_piece, board, i, j):
+                current_piece = new_piece
+        elif key == ord("s"):
+            if check_placement(current_piece, board, i + 1, j):
+                i += 1
+            else:
+                board = place_piece(current_piece, board, i, j)
+                board = clear_rows(board)
+                current_piece = PIECES[np.random.choice(piece_types)]
+                i, j = START_POS
+        elif key == ord("S"):
+            i = calculate_shadow(current_piece, board, i, j)
+            board = place_piece(current_piece, board, i, j)
+            board = clear_rows(board)
+            current_piece = PIECES[np.random.choice(piece_types)]
+            i, j = START_POS
+        elif key == ord("g"):
+            auto_gravity = not auto_gravity
+
+        # Gravity effect
+        if auto_gravity and time.time() - last_fall_time >= fall_rate:
+            if check_placement(current_piece, board, i + 1, j):
+                i += 1
+            else:
+                board = place_piece(current_piece, board, i, j)
+                board = clear_rows(board)
+                current_piece = PIECES[np.random.choice(piece_types)]
+                i, j = START_POS
+            last_fall_time = time.time()
+
+
+if __name__ == "__main__":
+    curses.wrapper(main)