To easily gain experience, when you get Naruto or any other character alone, go to the Forest Of Death. Stay in the little walkway at the beginning of the forest, and get into battles. When your health or Chakara gets low, go to the health pad outside. Repeat as desired.
After beating the game, go to the top of the academy, and speak to Konohamuru to get get a menu with three options. Select the "Summon Sheet" option to enter the following codes. Assume the touch screen is divided into a 4x3 grid, numbered as follows:
To unlock the following bonuses, quickly tap the corresponding grid areas. The numbers "1" through "4" will appear on the top screen to indicate the first through fourth numbers have been detected; this is not the "grid" number, but just to confirm that your tap has been detected.
BONUS - HOW TO UNLOCK Play as Jiraiya - Tap grid areas 11, 3, 1, 6 Fourth Hokage's sword - Tap grid areas 4, 7, 11, 5 Fuji Fan weapon - Tap grid areas 8, 11, 2, 5 Rasengan jutsu - Tap grid areas 9, 2, 12, 7 Rajin's sword - Tap grid areas 7, 6, 5, 11
After battling Temari and Gaara at the Chunin exams, you will face Kankuro in the Gaara's Pursuit level. Memorize their moves to defeat them. However, if every character is lower than level 40, train them to that level or higher to win.