When importing graphics, draw the grid with lines instead of dotsWhen drawing tiles in the map editor, display the preview as a replacement of existing tiles instead of overlapping existing tilesAdd "SelectLastCreatedSprite" rule functionAdd lastCreatedSprite to drop-down lists for parameters that expect spritesFix error with swapped X and Y values in preview of solidity mask when no alpha mask is appliedAdd Tutorial4.html for sound and music.
Keep in mind that during beta, changes are mainly for minor adjustments and bug fixes.