lets you join roblox console only games
you could make it spoof as Mobile/Tablet device but, that string is much longer and may need a different apporoach
(patched since some time ago, there is an extra thing needed to be done now)
Method 1:
rename RobloxPlayerBeta.exe to ogRobloxPlayerBeta.exe
rename this executable to RobloxPlayerBeta.exe and place it next to ogRobloxPlayerBeta.exe
Method 2 (recommended):
replace the original RobloxPlayerLauncher.exe in the roblox folder with the one from here
this will also prevent roblox from updating normally
if the scan isnt basicaly instant, then roblox didnt finish doing its thing yet, changing the Sleep time can help fix this
cause roblox website removes the play button to play open devtools, edit the code snippet and run it in console
Roblox.GameLauncher.joinMultiplayerGame("place id")
other ways of joining should work normally