The previous two Humble Indie Bundles have been unprecedented successes, launching otherwise lesser-known independently developed games into the big leagues through a single almighty ‘pay what you want’ sale, and all while helping charity along the way, too. Today, the announcement went out of a ‘bonus’ bundle being organized by Wolfire, featuring three games by graphically adept studio Frozenbyte, one unfinished prototype game (with source-code) and one preorder, all for whatever price you’re willing to offer.

While not quite as broad an offering as the previous bundles, these are some seriously great games and you’d be a fool to miss out on them. Trine in particular is widely agreed on as being excellent, effectively a modern update of the buddy-puzzle platformer The Lost Vikings. While good with a single player, the game doesn’t really shine until you’ve got two buddies with you (local-only, bring gamepads) and are having to help each other past every obstacle, rather than just switching character at will.

Shadowgrounds & Shadowgrounds Survivor are pure, simple, beautiful-looking fun. Probably a closer update of the spirit of the classic Alien Breed games than the modern Team 17 updates. Isometric third-person shooters, it’s just you (or some buddies in same-system co-op), a dark planet full of slavering alien monsters, and a clear goal: Get out of there without getting chewed into kibble.

The two bonus games look rather neat, too. Jack Claw is an unfinished prototype game where you play as Doctor Octopus, minus a few limbs. You’ve still got one big wobbly death-claw with which to pick up and throw cars and generally cause some chaos. While unfinished, the source-code is included, meaning that any well-meaning souls could probably polish it up into a more finished product if they so wished. There’s also a preorder on a mysterious new game called Splot, which (as the trailer above rightly points out) looks adorable. Not sure what it is, but given the pedigree of the studio, I doubt it’ll be anything less than fun.

No word yet on exactly when this bundle will be available to buy yet, but the current word is ‘later today’. So keep checking!