Lode Runner

You can freeze your opponent in midair by using yourpick axe over their head while they are either on a bar hanging,or falling through the air. If you do this, it will permanentlykeep them frozen and they will not be able to play unless youuse the "kill player" cheat. After they are frozen,a block of invisible land will remain where they are or were,and you can walk on it.

In the menu screen, press:

You can rebuild concrete land that you have blown upwith a big bomb by using your pick axe above the missing land.It will turn back into concrete when it expires.

Go to level creator. Make a level where a monk istrapped in a hole. Put a line of invisible ladders along whereyou want to walk just above the monk's head. Complete the restof the level as desired, or just add a treasure, an exit door,and a player and save the level. Go to where you can play thelevel you just made. Get on the monk's head. Start to walk offhis head. You should continue walking, even though there is noland to walk on.