Tingle Tuner
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In TWW, Tingle gifts Link with this funny little device. If players happen to own a GBA and a GBA/GC Link Cable, then a second player can take control of Tingle. Simply set up the GBA, activate the Tingle Tuner and you're off. The second player will find a map of the current area on his/her GBA screen, which includes, amoungst other things, a marker indicating Link's current position. On the main screen, the first player will be able to see a green marker on the gorund, indicating the position of Tingle.
The Tingle player now has a number of abilities. Firstly, by pressing A, they can cause Link to look towards the spot they're aiming at, secondly they can drop Tingle Bombs, for a small fee. The bombs are just one of a number of pay-per-use tools at Tingle's disposal, including a temporary magical effect, which gives Link a long-lasting version of the Hover Boots effect.