If you're sitting around this morning with a wicked case of the Mondays, this should cheer you right up: Vlambeer's Super Crate Box [$1.99] is currently on sale for the non-existent price of free in honor of the second birthday of the game. You really need to stop what you're doing right now and download it. Super Crate Box, as explained in our five star review is an action-packed single-screen game where you play as a little super dude running around inside of a box collecting crates, thus making the title of the game quite obvious.
Inside of these crates is various weapons, and you'll be constantly cycling through your available arsenal as you try to rack up as high of a score as possible. As you collect more and more crates, you'll unlock more weapons, levels, and playable characters.
The game is universal, and even has iCade support. If you're not downloading it already, you really need to fix that problem.