@eniko@peoplemaking.games I’m not sure how retro it counts as: it’s not very old, but it could have been implemented a decade or two earlier: Creeper World 3 is my favourite of the series. You are fighting some kind of nanotechnology goo thing, which means there is no enemy AI strategy: the goo appears from emitters and just flows across the map, filling up deeper areas first. In the player-provided maps, there are some ‘Coruncanis style’ that have an alternate play mode, where you don’t get any guns, just teraformers (which can raise or lower the level of walls) and there are flip emitters that produce creeper initially but anti creeper if they are flooded with anti creeper. It’s slow and relaxing in this mode, you’re just trying to replace blue puddles with white ones (or some other pair of colours if the map author changed the defaults). There’s a later variant that has stargates that teleport creeper, anti creeper, or both, across the map and have hats that can block endpoints.