Important Disclaimer: This guide is for educational and preservation purposes. The Mortal Kombat Arcade Kollection was officially released on PlayStation 3, Xbox 360, and PC. There is no official PlayStation 2 release of this specific collection.
Because there is no official PS2 version, running this on a PS2 requires one of two scenarios:
Below is a guide on how to navigate these options, find the files, and get them running.
If you have a physical PlayStation 2 (modded with FreeMCBoot) or use the PCSX2 emulator, the best way to replicate the "Kollection" experience is using Midway Arcade Treasures 2.
Disclaimer: Distributing or downloading copyrighted arcade ROMs (Mortal Kombat 1, 2, and UMK3) is illegal in most jurisdictions unless you own the original arcade boards. However, many users argue that since Warner Bros. no longer sells the Arcade Kollection (delisted from PSN/XBLA in 2016), it falls into abandonware. Courts disagree, but enforcement is rare.
If you choose to proceed, never download from shady pop-up-ridden sites. Look for:
Always scan the ISO with Virustotal before loading it.
UMK3 on Midway Arcade Treasures 2 has noticeable input lag and audio desync. The Arcade Kollection version is tighter, faster, and includes the hidden character Human Smoke (hold Start + LP+HP+BL+LK in the character select screen) without glitches.