Lamp Grid
All agesA calm 5×5 puzzle: pressing a lamp flips it and its neighbours. Switch every lamp off. Three puzzles a round, no timer.
Any screenAd break at most every 5 min
Playing is free and earns nothing by itself. A game may offer a short ad break at a natural pause; you can always say no, and a break you finish is paid exactly like watching an ad.
A calm 5×5 puzzle: pressing a lamp flips it and its neighbours. Switch every lamp off. Three puzzles a round, no timer.