Hey we finish the sealed hyrule castle level its not that much actually but then again the castle is short too, right now we are doing the hyrule castle were all the enemies are moving and you have to kill them. I'll send a pm of the level.
hmmm how slow is your computer? like how many years has it been running? Because this game sometimes lacks. well to download it go to general and there sould be a topic saying "SMBX 1.1.2 beta 4" save it to your computer and open it, then unzip the zip folder, then you should see to mushrooms saying SMBX and editior, press editor so you can play my game, but i prefere you pratice on using the contorls. hope this helps.