The game that not only requires a hacked or homebrew-enabled PS3, but a little imagination is ThatOtherDev's "They Do Not Die 2." Now at version 0.6 you'll notice plenty of improvements since our last coverage, which was
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I say you require imagination because this is a "zombie shooter," minus the zombies in a graphical/visual sense... Zombies are green circles and you're the yellow one.
Below is a gameplay video demonstration; however, it was recorded on the Wii, but you get the general idea. Visit the source if you're interested in downloading the Wii version.