There are currently 2 smashing chapters to this game; GeoDefense and GeoDefense Swarm.The differences between them being that one provides a pre-defined path for the ‘creeps’ you are trying to destroy and the other (Swarm) favours more open levels on a grid where you have to be a bit more strategic in your tower placements. Both games have a neon-glow, retro design which looks fantastic and really makes it clear to differentiate between various towers and also various creeps. Both chapters include a large selection of levels and also additional level bundles are available so you’ll be playing these for a long time to come.