Hexcells is a free minimalist puzzle game. It has no ads or purchases, and does not require internet.
The way to play is simple:
Place marbles into a hexagonal grid until none are left. Each color marble has a different rule it needs to follow in order to complete the puzzle, so finding the correct arrangement of marbles is the challenge. With over 100 handcrafted puzzles to solve, the complexity increases as you go. Can you solve them all?