Unlock the following characters by performing the corresponding tasks:
CHARACTER - HOW TO UNLOCK Astronaut - Collect 10 crates on Moon Temple under the Normal difficulty. Billy - Collect 100 crates under the Normal difficulty on any stage. Chicken - Collect 50 crates on any stage in SFMT mode. Crocodile - Collect 25 crates on Construction Yard under the Normal difficulty. Ninja - Collect 20 crates in Ambush mode on any stage. Piklupu - Collect 35 crates on Moon Temple under the Normal difficulty. Robot - Collect 30 crates on Rocket Silo under the Normal difficulty.