I had to go to two stores to get all the games. The first allowed me to buy the games alone, but the manager said they only had the "Sneak Peak" one.

:lol:

Off to the next store, where I had to buy a value meal, but I could buy as many games as I wanted.
[quote name='evanft']Has anyone tried playing these on the original Xbox?[/QUOTE]
I have, and I'm disappointed, but probably not for the reason you think.
I like the games. For the price, you can't beat them and they aren't bad really. Neither Big Bumpin' nor Pocket Bike Racer support Xbox Live multiplayer for the Original Xbox, only local multiplayer for up to 4. I feel a bit mislead.
As a consolation, the Xbox version of Sneak King does have controller options for sensitivity, vertical look inversion, and rumble, but the missions don't feel as rewarding without the motivation of acheivements.
Achievements and online multiplayer add a lot of value to these games. They're probably still worth the $4 each as they are on the Xbox, but they're that much better, not to mention the improved graphics, on 360.