Karl

The Karl was a Tier I SPG added on April Fool's Day 2014 and removed on the 4th. It could only fight in 7 vs 7 matches against other Karls, on the Labyrinth game mode. It could be obtained by logging in from April 1-4. After this, the Karl would be given, along with a free garage slot, until the end of the event. Interestingly, the Karl sold for ¢0, possibly as part of the joke or to disable the ability to exploit it for money, a crew member and a garage slot due to the fact that it would be removed.