Interesting Grids

More to come, gradually...
1. Extreme-5:
   5 Diabolical/Extreme solutions in this one grid, if the options are known. (20080803)
2. Extreme5 + 1 clue   and solutions.
   Not too tough, if just add one more clue.
   Note options are not consistent with ratings now. (20080803)
3. A SuBundle grid with 8 keys / 256 solutions.
   Can you put more keys in a grid? Or, find a subundle grid with more solutions?
   With proper keys of course. (20080804)
4. RCN/Extra Extreme-5: ( SVG ,PNG )
   If the extreme-5 in (1) are not tough enough,
   Try these 5 extremes in our RCN variant. (Solutions ,SVG , PNG )
   We only know they are tougher, but don't know by how much.
   Other RCN games are not as difficult.(20080816)
5. A SuBundle variant grid for Math teachers.
   It is not difficult, just some little fun, and maybe educational?