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* [[Gens]] is close to Kega Fusion in features and compatibility, but it has been largely surpassed by better emulators. There are many different forks and iterations of Gens, and your experience will differ quite a lot depending on which version you use.
* [[BlastEm]] aims for cycle accuracy but for lower system requirements than Exodus. It has substantially higher compatibility than Exodus but falls short of Genesis Plus GX.
==Lock-On Emulation==
Lock-On Technology is a unique feature found on Sonic & Knuckles cartridges for the Sega Mega Drive/Genesis that allowed a player to connect an older game to the cartridge's pass-through port for extended or altered gameplay.
* With Sonic 3: Unlocks an alternate version of Sonic 3 with more levels.
* With Sonic 2: Unlocks an alternate version of Sonic 2 with playable Knuckles.
* With Sonic 1: Unlocks the Blue Sphere minigame with a level select to all possible levels.
The Sonic & Knuckles cartridge can lock on to other cartridges:
* Smaller than 2MB: Will play a single random level from the Blue Sphere minigame generated from data in the header.
* Bigger than 2MB: Will boot to Sonic & Knuckles.
* Has Battery Pack: All save data will be wiped out.
Most emulators don't support Lock-On save for Genesis Plus GX, but there are pre-combined ROMs for the Sonic trilogy available online that can be played as a regular Megadrive ROM on any emulator and still work. The Sonic 3 Complete romhack also achieves the same purpose.
Genesis Plus GX's RetroArch core includes true Lock-On emulation. From the Core Options menu, you can enable the Lock-On feature for either Sonic & Knuckles, Game Genie, or the Action Replay (Pro) -- the latter two using a different technology but with similar effects. Setting this option to anything other than "Off" will enable Lock-on to the cartridge you're currently playing as. After resetting, the game will boot in Lock-On mode.
The following files need to be under the directory for BIOS files (usually "system"):
* sk.bin (Sonic & Knuckles (2 MiB) ROM)
* sk2chip.bin (Sonic & Knuckles UPMEM (256 KiB) ROM): If you can't find it online, extract it with a hex editor from a pre-combined Sonic 2 & Knuckles ROM from offset 00300000 to the end of the ROM.
For GG/AR, the files needed are areplay.bin and ggenie.bin, but most emulators support cheat codes from these natively.
==External links==
