Bend is a word game on the surface of a Klein bottle. The board wraps in an unusual way: moving right past the last column continues on the mirror row — row 1 joins row 5, row 2 joins row 4, and row 3 joins itself — and moving down past the bottom wraps to the top of the same column. Move around the board with the arrow keys; because the board is a Klein bottle the arrows follow the wrap, so at an edge you may jump to a different row or column. Press Enter or Space on a rack tile to pick it up, then Enter on a board square to place it, or Enter on a tile you just placed to take it back. Activate the Submit button to score. A word that wraps top to bottom scores double; a word that bends across the flip seam scores triple; you cannot score the same word twice, but reforming it across a seam upgrades it.