It's quick to play (~1 minute) and the strategy gets surprisingly deep once you start thinking about cascades and efficient pathing.

Initially I started with a 12x12 grid, but after testing with some friends it felt way too overwhelming. It made it hard to feel like you could have a strategy. Once I simplified it to a 5x5 grid the game felt a lot more fun and approachable. You can also play more than once each day so you can keep trying to beat your score.