Eight years on, Subnautica is back in Steam's top ranks — and still terrifying (store.steampowered.com)
Subnautica strands you alone on a water-world after a crash, with little more than a survival knife and a cramped escape pod. You craft, dive deeper, and try not to think about what's swimming beneath you.
No sale or patch obviously triggered the resurgence; the pull is the game's own reputation. The reward for diving past your fear is some of gaming's best underwater wonder.