This game is amazing! I have always loved it, and it's the best Crash game created.
I'll start with the levels. This game has fun levels that get more challenging as you get farther into the game. There's a lot of stuff you can unlock and try to beat. The levels are creative and there's a variety of different types. (For example, there are levels where you are on foot, ones where you ride Pura, the tiger, ones where you ride a jet-ski, ones where you are on a motorcycle, etc) There's a lot to beat with the levels. You have to get crystals (1 in each level, you find it somewhere in the level and have to make it through the level to get it), gems (you get these by breaking all of the crates/TNTs/Nitros in a level), and Relics (You get these later in the game by making it through the level quickly).
Overall, this is a really great game. It's fun and you don't have to be really good at video games to play it. (but it's hard to beat.) If you haven't played this game, you should definately try it.