Forgot to include which keys to use to change the size of the worlds. They are the plus and minus keys to the left of the backspace key on standard keyboards. (now noted within the scenario description).

@Super_Hippo, I should allow block to spawn on the right edge. However, if I do restrict spawning blocks on the left edge and continue to spawn the player at that edge, then if the second column is tall and the first column is short, the player will be stuck indefinitely (well, until a column does complete fill to the top, which would be game over, anyway). So, that would add more responsibility to the player: to push blocks to the left edge to keep it close in height to the adjacent column.

@Super_Hippo, thanks. Atm, yes -- you die if a column fills to the top (kind of forces you to maintain a level playfield). However, since you really cannot do anything about the left and right columns, maybe I will restrict spawning at those location but still allow blocks to be pushed along those edges.

@Super_Hippo, it would be easy enough to just pass the game world to the instruction world and return to it when the back button is clicked.

You could create a "transfer" object, using the eyes images for it, to "carry" the ghost back to the ghost box. If interested in this idea, start a discussion thread.

@lordhershey, this is a copied scenario (it may or may not have any changes to it). The original is here: http://www.greenfoot.org/scenarios/189

The clock image is not centered on the image and makes your hands look like they are not pivoting at the center of the clock. If you place the Clock object at (295, 202), it looks better.