I made a sad discovery that what I thought was my original idea in the "20 Hops" game has been done before. In fact, as far as 7 years ago (or 11 years ago?), TANSTAAFL developed "Kight's Challenge" and put it on Game Development Showcase. His game comes with nice graphics, animation, sound effects, and a bigger board. So, moving forward, I need to put more effort on product differentiation, such as trying to come up with a friendly hint system.I implemented undo. Download Version 1.02.
I'll let you in on a little secret. Idea's are pretty much worthless. What matters is how well you turn the idea into reality. Just about everything around you was an original idea at one point but the people who got rich from it are usually not the one's who came up with the idea first.
My advice: Stop trying to find an orignal idea and just make what you enjoy. Every game that isn't an exact clone has some originality too it anyway.