User Guide

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When moving up, this script relies on the background masks to
stop the player sprite. But the script to move down uses the y
position to restrict the player’s movement. Add these blocks
underneath the if key up arrow pressed? block:
When you move the Billy sprite, your walking sprites may not line
up with GBilly. To fix this, edit the costumes in the Paint Editor
and “nudge” the costumes to the left or right.