I used it in my programm code as a counter, to use it this way make you plant only one or two bombs before you can plant another one ((ger.) BOMBEN = (engl.) BOMBS). For explainig the "--" command you can use the describtion of mjrb4.

if you want to make it more fun you can add an "atWorldEdge" command to get the two chars of your game on the other side of the "battlefield" when they get at the World Edge. ^^ :)

thanks for your nice comment, your game is good too. Tip: Maybe you could time the remove of the first part of the explosion a little better :) (Sry my english is not the best ^^)