Controls: ←/A left, →/D right, Space fire. Enter to (re)start.
In all modes: collide with a good word = +10 (safe), collide with other word = Game Over. Laser: normal +1, good −2. Score may be negative.
Easy: horizon −1 (no game over), good words highlighted, fall slower.
Normal: horizon −2 (no game over), good words slightly distinct.
Hard: horizon = game over, no visual distinction (also no spawn bias).