Are you sure you want to leave Paper?
Continue to https://github.com/eMoflon/emoflon-ibex-examples/blob/354da2f94790335a34b8030ac56ac47580566a97/sokoban/SokobanGUI/src/org/moflon/tutorial/sokobangamegui/rules/SokobanRules.java#L14
Please turn on JavaScript to use Paper in all of its awesomeness. ^_^