This is similar to Map40, except that the blocks are now ice, and 2 of them will slide off without any interaction. Experienced mice can get to the other side either by jumping quickly, or jumping on the small off-screen blocks that support the Ice. It is recommended to wait for a shaman to build a bridge to complete this level.
A shaman can build a bridge over pit, adding a support every 1-2 planks. Sometimes mice can be trapped on the invisible blocks, and the shaman should choose to help or to kill them.