Game with a fun factor but Disabilities

I know Assasin's Creed since I had on my previous phone. It was also a lot of fun there, just like on the PSP that i owned. Unfortunately I had to find the beginning of the disappointed DS game that you can only move left and right. That's why I was and am really disappointed. Otherwise it's still fun and who can live with it and also loves Assasin's Creed, the game should get.