I go back to a few almost routinely.

• Mount and Blade: Warband (with and without mods)
• Rocket League
• Crash Bandicoot 2&3
• OpenTTD
• Pokemon (The mainline ones are all basically the same game lol)

For M&B and OpenTTD, being able to rely on my old knowledge of the game to succeed feels satisfying since they both have a steep learning curve.

For RL and Crash, muscle memory taking over the majority of play is relaxing.

For Pokemon I just have a crippling amount of nostalgia