Radium:

You can use it as an instant death device if you know how. What I do is use a series of 4 rows of events. The top row is sucker tubes with Y speed 63. This ensures you lose a life unless you are cheating. The next row is red ctf bases. NOTE: YOU DO NOT NEED BLUE ONES. The third row is sucker tubes with speed 0, 0. Do not give it any x or y speed. This provides just the right delay time for this to work. The final row is "bees" events. This works because when you hit a ctf base, jj2 is tricked into thinking you have 0 hearts remaining. When you hit the bees, you drop to -1. Suddenly jj2 figures out you are dead and you lose a life. The top row of sucker tubes is not vital, but the other 3 rows are. Also note that you need at least 8 events for this to work.

Also, unlike what some people think, you do not need to put the ctf bases in walls or put 2 on top of each other. One row of red bases always works.