> The real issue with freemium is that I've yet to see a single example that's actually a game, as opposed to one armed bandits masquerading as games.
Auditorium[0] is a fantastic freemium game: it's a particle flow-based puzzle game, the first 5 acts (5~7 puzzles each) are part of the free game (also available on the game's website[1]), a further 10 levels are available in 3 packs at 0.99 each.
[0] http://itunes.apple.com/fr/app/auditorium/id333186527?mt=8