Lemmings is an arcade game, with a US prototype release. This suggests the game was in development, potentially undergoing testing and adjustments before its full release.  Information about its final release, if any, and its original developer remains unclear.  The prototype likely features core gameplay elements, but may have differences from a potential full release version.  Identifying the company or organizer requires further research.

Lemmings (US prototype)

Legendary Wings (US set 1)