what is the a bizzare run playtester called

The playtester is most likely called A Bizarre Run or ABR. Posts and videos around the game use that name consistently, including “A Bizarre Run PLAYTEST” and “I Got to Playtest A Bizarre Run,” which suggests that’s the title people are referring to.

Name used online

• A Bizarre Run appears to be the game name in recent forum-style posts and clips.

• Some creators also shorten it to ABR in descriptions and hashtags.

• One listing even shows A Bizarre Run [RELEASE] as the full title for the Roblox experience.

If you meant the tester

If you meant the person who playtested it, the posts I found do not clearly name a specific playtester, only the game itself and people saying they played the playtest.