Write the prompt around a playable rule
The prompt defines a binary mirror state, live path preview and a blocking rule. This makes experimentation informative: each tap changes a visible segment. Use distinct marks for source, wall and target. The first level should require one reflection, then a later level can ask players to route around a wall with a second mirror.
Original concept prompt: “Create a grid puzzle where a beam starts at a marked source and must reach a crystal. Tap a mirror to rotate it between two angles; the beam path updates immediately. Use three mirrors maximum in the first level, and place a wall that blocks the beam. Complete the puzzle when the crystal lights up.” 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
Rotate each mirror and verify that the beam reflects according to the displayed angle. Check that walls stop the beam and that the crystal lights only when reached. If a path passes through a mirror without turning, clarify the mirror orientation or simplify the grid. Try solving the first puzzle without trial tapping to see whether the board gives enough information.
Add a new mirror or a splitter only after reflection works reliably. If there are multiple solutions, accept them unless the puzzle depends on a specific route. If players get stuck, offer a hint that highlights the first useful mirror rather than showing the whole solution.
Do not hide beam paths or use decorative glow that looks like an active beam. Keep the rule consistent and the grid aligned. If the target is unreachable, verify the puzzle layout before asking players to try again.
Playable reference for this prompt: Elements. Drag and release to drop glowing atoms into a jar; two of the same element fuse into the next one (H→He→Li…), revealing its name and a fun fact. Don't let the pile cross the line. Use this example to compare the proposed rules with a game you can try now.
Questions about light puzzle game prompt
How should mirror rotation affect the beam?
Update the displayed path immediately after a tap. Test both mirror angles and blocked routes so the preview agrees with which objects receive light.
What should I test before adding more mirrors?
Verify one reflection, a wall blocking the beam and a complete route to the crystal. More mirrors should combine working rules rather than hide an unclear first reflection.