Sally Acorn in Sonic the Hedgehog 2 (aka Sally in Sonic 2) is a fan-made ROM of the game Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with Princess Sally Acorn as a playable character in place of Sonic the Hedgehog
The game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including MainMemory, Qiuu and Snkenjoi.
Sally is slower than Sonic and can't use spin attacks; however, she has a number of stealth and agility-based abilities to compensate and access areas Sonic had difficulty reaching, as well as the use of handheld device NICOLE:
NICOLE Laser Attack: Press A and Sally uses NICOLE to fire a small projectile which hits nearby enemies and obstacles. NICOLE Scan Mode: Press B and NICOLE will send a data wave to reprogram monitors and other Eggman traps. NICOLE Downward Laser: Press Down + A/B while airborne to fire or scan at objects straight below. Sally also gets a small vertical boost. Slide: Press Down while running to slide on the ground for a short distance. Sally can also slide under certain obstacles using this method. Somersault Dash: Press Down + C while sliding on the ground and Sally will somersault forward at a high speed. This is useful for jumping long distances. Upward Dash: Hold Down + C while on the ground and Sally will rev her feet on the spot as opposed to a spin dash. Let go of Down to charge full throttle in the facing direction. Be careful though, Sally is vulnerable to blockading obstacles and enemies.
Sally gains a few stipulations akin to Knuckles in Sonic 2, for example, the ring quota in Special Stages are depleted and she retains her ring count after losing lives or entering starposts. 2 Player options (also with Sally replacing Sonic) and the ability to play as Tails remain from the original game however.
On the level select sound test, play 03, 03, 03, 0B, 10, 10, 10, 04 to enter a hidden bonus.
Screenshots & Videos
Sally blasts an enemy
http://shc.sonicresearch.org/Image/e64i2_2015|320|224|352|Sally blasts an enemy
It's a Sally Jackpot!
http://shc.sonicresearch.org/Image/e64i3_2015|320|224|352|It's a Sally Jackpot!