Tough decision, I doubt everyone will agree. I do put Little Samson ahead of Bubble Bobble 2 in terms of rarity though.
I don't see how Race America, Color A Dino or Kid Klown can be that up there either since they go for so cheap. I know that price does not just equal rarity (also demand), but if a game is truly the 3rd hardest to find in a set, then it's going for more than $20 loose. It's not like Flintstones 2 is worth $150-$200 because there's a long line of people willing to play it... it's price is based on rarity.
If I had to make a guess, I'd go with:
1) SE
2) F2
3) Little Samson
4) Power Blade 2
5) Panic Restaurant
6) Bonk's Adventure
and Bubble Bobble 2 somewhere after those in the top 10. Once again, just educated guesses and I'm sure no one will be in complete agreement.
