Terraria

Terraria is a 2D sandbox from Re-Logic that blends action, exploration and building. You are dropped into a world where you have to survive, gather resources and craft ever better gear. Every world is generated at random, so each adventure is different.

You dig mines, descend into caves, fight bosses and build your own houses and towns, which fill up with characters you meet along the way. Progress unlocks new materials and threats, and what you do is up to you: hunt treasure, fight tougher enemies or simply build.

According to HowLongToBeat, the main progression with bosses takes about 52 hours, and a 100% run about 205. At around two hours a day, a month is enough for the main progression but not for everything. The game has multiplayer, but under the offline rental the single-player mode is available, and it is complete in its own right.