[matheusmoreira]

I love it when games have a creative mode. It's a nice balance between challenge and fun. Subnautica for example has a normal mode, a hardcore permadeath mode and a creative mode with no death and infinite resources. Building bases everywhere and watching the beautiful underwater landscapes and marine life is just so soothing.

[huachimingo]

LittleBigPlanet was a blast on creative/user-made maps.

You could have a fairly stupid concept (free-falling sponge, with a shark that follows you while only in water), copy the whole level and mod it to whatever new state you wanted.

[tenpies]

Frostpunk's sandbox mode was also fantastic.

Just build your city. Tech up. Send your explorers. Enjoy the beautiful scenery and soundtrack. And try to ignore the increasing semblance between our energy policies and the game's world.