Those that spend at least $7.25 as of this writing will receive Ibb and Obb as well as Proteus, the former as a "Best Friends Forever Double Pack" that includes a second Steam key to give to a friend. By dishing out at least $8, players will also get Dinosaur Polo Club's Early Access game Mini Metro and Incandescent Workshop's Artemis Spaceship Bridge Simulator. The latter is a multiplayer-only game, which is why it will also come with a second Steam key for fellow starship troopers to enjoy. The final tier gives players four more copies of Artemis Spaceship Bridge Simulator in addition to all the other games listed, for $17.
[Image: Humble Bundle]