I FINALLY DID IT!
> Fullscreen recommended <
You used to work at Joe's Stable as a horse, but got fired.
Looking for job you find an offer, but it's for humans only.
Wear the Human Mask, do the job.
Hold left and right mouse button to lean left and right.
Hold both left and right at the same time to crouch. Release to jump.
While jumping, aim with the mouse and left click to attack.