for cheat:
Edit the BOXWORLD.INI file in your Windows folder changing the levels to 99 so that you can play at any level...before changing the file create a backup copy of the file...
for hint
Level select:
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the " boxworld.ini " file in the Windows directory. Edit the level value to the desired number and begin game play. Note: The shareware version of the game is limited to the first 13 levels.
I managing to find these...hope this help you...