The tin can first appeared in 1001.

Tutorials pop up when new characters appear!! At level 1001, I guess that colored tin can first showed up haha If it's not the same colored animal block, it only disappears with items. In situations like this, the combination of bombs and missiles eliminates three rows horizontally and vertically in a cross shape, so it's super useful lololol I finished this level a long time ago, and I beat it in 13 out of 35 turns!!