It's a simple match-3 game. You can choose your play mode: swap, pop, or chain, but I think it is only possible to win all the levels with swap. You can play with a turn limit (challenge mode), or unlimited. I enjoyed it while listening to podcasts.

It's a nonogram game, and it is good. I prefer Paint it Back, but this one has community content so you can play nonograms created by other users, or even create some yourself, so there is basically unlimited play value.

I try to "play" this almost every day, but especially when I'm feeling down. I try to go on and reply to others helpfully and kindly and sometimes write requests myself. It's all anonymous. It's a great community. It's a great way to counteract the negativity of day to day living. Highly recommend.