Instructions: Background You are a stranded marine, with no no chance of surviving. But you can compete for high scores by climbing as high as you can before you die! Controls W â€“ Jump A â€“ Left D â€“ Right Left Click - Fire Main Instructions Move up the level, using the platforms as steps and double jumping. Kill any oncoming zombies and grab health packs if needs be. You only have limited jump at any one time, before it recharges, so use it wisely. Tip: The jump bar refills faster when you're standing on a platform.