In Naraku's Trap, the roulette is an important part of the game, similar to dice in a boardgame.
The roulette is used for various things in the game, from moving around the map, to attacking your opponents.
Getting The Result You Want
The roulette is not based on chance or luck. It is possible to get the result you want. For example, if you were trying to avoid an opponent's attack, you have to aim for the result that ensures success. How?
The possible results for the roulette are displayed in the boxes under the roulette. This tells you which colour you must aim for on the roulette. So if the result you want is on the yellow box, aim to stop the roulette at the yellow part.
This is quite easy in the beginning of the game, but later on in the game, the number of possible results increases from 6 to 12, and again to 18. Or in other words, the odds of getting what you want changes from 1 in 6, to 1 in 12, to 1 in 18.
If you don't get the result you want, too bad, unless you are using an emulator such as VisualBoy Advance to play the game.
Some people may be familiar with saving slot, but I'll explain it for those who aren't. Saving slot give you a great advantage in any game, not just Naraku's Trap. It allows you to save and load at any point in the game. So you can save your game just before you spin the roulette, and if didn't get the result you wanted, you can reload and try again.
Basically, there are 10 'slots' that you can save in. To save in slot 1, press Shift+F1, to save in slot 2, press Shift+F2, etc. To load slot one, just press F1, to load slot 2, just press F2 etc. You get the idea, right?
Why would you want to save slot when the game allows you to save any way? Well, there are times in the game where you cannot save. For example, you cannot save just before you spin the roulette. So if you mess up, you can't go back to try again. But by saving slot, you will be able to go back to that point in the game. Pretty useful, eh?