Grim Joggers is an interesting take on the running game genre made famous by the innovative and artistic game Canabalt. As in all games in the running genre, your goal is to survive as long as possible in a dangerous, fast-moving landscape. While you'll mostly be trying to beat your previous high scores, Grim Joggers also supports Game Center so you can match up your best distance with other players around the world.
What sets Grim Joggers apart is that instead of just one character to control, you're controlling an entire team of joggers you'll need to keep alive as long as possible to shield you from your impending death. With a long train of extreme joggers behind you, you not only have to be aware of timing your own jumps, but also whether your timing will send members of your team over a ledge or into the waiting mouth of man-eating plants (in the opening jungle level). Apparently, in the sport of extreme jogging, pits and walls of spikes are commonplace, so you'll need to be extra-quick to save both yourself and your team.
Grim Joggers currently comes with three levels, and you'll need to complete various achievements to unlock the second two. The developers have plans for at least one more level with a placeholder already in the game that says "Coming soon," but there is plenty of content here to keep you busy in the meantime.
Overall, if you like the running game genre, Grim Joggers adds a couple of unique gameplay twists that make it both fun and challenging. The overarching humorous theme of extreme jogging and the somewhat gruesome (but funny) deaths of your team members is just icing on the cake.