Beta3 is a leaked beta fabricated approximately two weeks before Quake was released. Many things are quite similar to the final version, but there exist a few nuances. It appears to be in a state between the shareware version and the retail one, given that messages requesting the player to purchase the game appear when one approaches Episode 2: The Realm of Black Magic, Episode 3: The Netherworld, and Episode 4: The Elder World. However, the Episodes are completely playable.