If you're an Android user
Humble Bundles are great, depending on how many gaps there are in your videogame library. (Although, admittedly, they're sometimes so cheap even that isn't a setback.) But, ideally, you don't want to wrack up a bunch of duplicate purchases. I won't have that specific problem this time.
The Humble Mobile Bundle 6 is offering pay-what-you-want pricing for Eliss Infinity, Duet Premium, and Combo Crew Special Edition. Beat the average of just under $4 for Threes!, Mines of Mars, and Joe Dever's Lone Wolf, with additional unnamed games to follow soon.
In particular, Eliss Infinity looks like it'd break my brain. Shame I'm an iPhone owner.