How do you get past stage 12 of bloxorz?

Answer 1

Solve all 33 levels by maneuvering the Block so that it falls through the exit hole. The solution of each stage can take dozens of moves to complete, often triggering special squares in a particular order.

(see the related question for the solutions to all 33 levels)

Answer 2

with the arrow keys

Answer 3

There are written walkthroughs at the related question.