NyanKo

It's a bit tough if you don't look up a guide, as it requires solo play and some grinding, but I find it strategic and fun enough to be one of my favorite games. A game where you beat the world, future, and space, and then the real game starts from 'Gure Shinre'? LOL

It's a game where strategy is important. Playing is simple because you just use money to gacha for characters. However, it can be tough since it's mostly luck-based.