Slime Rancher 2

Slime Rancher 2 is the sequel to the award-winning original, developed and published by Monomi Park and enjoyed by over 15 million players. Rancher Beatrix LeBeau journeys to Rainbow Island, a mysterious land brimming with ancient technology, unknown natural resources and an avalanche of wiggling, jiggling new slimes to discover.

You catch slimes with your vacpack, raise them and collect plorts, the resource that earns you newbucks. Those earnings and resources let you upgrade the vacpack, build new gadgets and expand the conservatory, whose sparkling glass walls give a view of the prismatic paradise around it. There are slimes never seen before, such as the bouncy cotton slime or the aquatic angler slime, and an island with secrets to uncover.

According to HowLongToBeat, the main run takes about 21 hours and a full run about 49. In a month at roughly 60 hours you can finish it entirely, with room to spare. The game is single-player and works offline.