Eyemaze

This site has a bunch of flash games all made by presumably the same guy. Check out the "Grow" series. You put things down in order, and if you get the right order, then cool stuff happens. If you don't, then it doesn't. It's not especially logical at the outset, and there aren't clear correlations between objects before you plant them. Lots of trial and error. Lots of time wasted. Thanks, Greg.