Further information :

Amy's abilities mirror those she utilized in Sonic Advance. She is slower than Sonic and can't use spin attacks, however has a number of abilities (mostly using her Piko Piko Hammer) to gain manueverability and access areas Sonic had difficulty reaching:

Hammer Attack: Press A and Amy swings her hammer, damaging enemies. In addition, Amy can use her hammer to smash obstacles such as walls and hit springs.
Hammer Jump: Press Down + A on the ground and Amy smashes the hammer into the ground, launching her into the air.
Hammer Whirl: Press Down + A in the air and Amy swirls down toward the ground. If an enemy is hit Amy will bounce up again.
Giant Steps: Press Down + B/C while on the ground and Amy will take a giant step forward as opposed to a spin dash. This can be repeated so long as there is room. This move is good for getting up steep slopes; she can even get up slopes the others can't spin dash up!