CI3 brings more brain thinking elements than CI1 and CI2. Timing is not important in CI3. So if you don't want to think to solve levels, CI3 may be a little boring. But for brain game lovers, CI3 would be fun. Some levels in CI3 are really challenging.
to cche: for most cases, there is only one choice for the final operator, so I make it auto selected. If there are many players don't like this, I will change the design.
Thanks tapir, i love your physics games ;)