Write the prompt around a playable rule
The prompt defines alignment and consequence, then adds a shadow as a cue. The player should be able to judge where the slab will land before tapping. Avoid sudden speed changes early in a run. If the game includes a combo, explain its effect or keep it as feedback rather than attaching an unclear hidden bonus.
Original concept prompt: “Build a one-button tower game on a rooftop. A slab moves horizontally above the stack; tap to drop. The overlapping part stays and the overhang falls away, making the next slab narrower. Show a shadow of the landing position and award a visible combo for a fully aligned drop.” This is a recipe for an idea, not a claim that this exact game is already playable.
Play, observe and refine one thing at a time
Try a near-perfect landing and a late drop, then compare the remaining width. Check that the shadow accurately predicts the landing and that a perfect placement is recognized consistently. If a narrow stack becomes impossible after one mistake, slow the movement or preserve a minimum width for a few turns to give the player a chance to recover.
Tune speed progression using actual attempts. A gentle increase after several successful drops rewards learning; a sharp jump makes earlier skill irrelevant. Change only the speed curve or the initial slab width at once. Replay until you can describe why a run ended, then decide whether the challenge needs a cue, a wider window or a more forgiving opening.
Do not equate a difficult game with a fast game. Precision comes from readable timing and consistent consequences. If every landing is judged by a tiny center point, widen the acceptable overlap and let accuracy bonuses carry the extra challenge.
Playable reference for this prompt: Stack. Tap to drop each sliding slab onto the tower; any overhang is sliced off, so perfect drops keep it wide. Use this example to compare the proposed rules with a game you can try now. For your version, use this check: How should a partial landing change the tower?
Questions about tower stacking game prompt
How should a partial landing change the tower?
Keep the overlapping width and remove the overhang. Verify that the next slab uses the resulting width and that a complete miss ends the run.
What is a useful first alignment aid?
A landing shadow makes the drop position readable. Test it at both edges of the tower; misleading shadows can make otherwise consistent collision rules feel arbitrary.