This article has a talk page!This page details one or more prototype versions of SteamVR Performance Test.
Half-Life 3Leftovers of the greatest game never made.
Left 4 Dead 3A sequel to Left 4 Dead 2 that seems to be left for dead.Counter-Strike: Global Offensive#
Models#
C4#
Within The Lab's files, the C4 bomb model made for Counter-Strike: Global Offensive's cinematic trailer can be found. This C4 model generally has more details around it and a larger countdown screen compared to the model used in-game. 
Portal#
Models#
GLaDOS's Human Face#
Within the files for GLaDOS' model folder exists a model of a creepy looking human face that was removed from the initial releases of The Lab. The face was intended to be paired with glados_model (which was not removed from the final game), and even has its own animation for GLaDOS rolling her eye panel back to show her face. The face itself has morph channels for flexes, which indicates that it would've likely been animated. Nothing is known about why this sequence was made.
Bendy Offices#
A near-identical offices model to the one used in the Portal 2 Valentine's Day ad, called "Bendy Offices".
Portal 2 Leftovers#
Super 8 Papers#
A leftover Portal 2 texture for the papers in the interactive Super 8 teaser.
Dota 2#
Models#
Heroes#
A set of high quality models for the Dota 2 heroes were included.
International#
A set of concept models made for the arena used in Dota 2's biggest tournament, "The International".
Half-Life#
High Poly D0G#
A high poly and slightly untextured model of D0G. The model was originally leaked onto 4chan, before being found within the SteamVR Performance Test files. Despite depicting a Half-Life character, there is no indication that it was used for Half-Life 3. It was later reused and finished for Half-Life: Alyx.