Teenage Mutant Ninja Turtles/Items

In the NES version, items are replenished after you leave an area, so you can take the same slice of pizza over and over. This is not necessarily true of other versions of the game.

Weapons
Each weapon upon being picked up will supply 20 of that weapon.
 * Shuriken - "Ninja stars". Does 1 bar of damage. Travels all the way across the screen.
 * Triple shuriken - Same as shuriken but you get a three-shuriken spread. Since they're better than standard shuriken, they're less common.
 * Boomerang - Does 1 bar of damage. They only travel a short distance before going in reverse. If you catch it, you regain it. If you don't, it travels across the screen exactly as a shuriken.  If you switch characters and catch the boomerang, that switched character will obtain the boomerang and overlap other inventory.
 * Kiai - Does a whopping 2 damage. These scrolls only appear in certain locations and cannot be retrieved by enemies, unlike the other 3 weapons.  They travel across the screen and covers a wide range.  The best weapon in the game.

Pizza
These cannot be picked up. They are used automatically when you touch them.
 * Slice: Recovers two energy squares.
 * Half: Recovers four energy squares.
 * Full: Regain all energy.

Miscellaneous

 * Rope - Used to cross buildings. Only actually needed one time in area 4, and the rope item comes not long before it. It can be found in area 3, but the only places you can use it there are not worth bothering with. Each rope item gives you three ropes.
 * Missiles - Used to destroy barricades or Roller Cars in area 3. Each missile item gives you ten missiles.
 * Invincibility - Kill enemies on contact when this is in effect. Used automatically when you touch it. They are most extremely rare.