Gameplay
The primary tool used in the game is the paint gun which fires two kinds of gel, blue and orange. Both gels were featured in ''Portal 2'', with the blue providing a jump boost and bouncing pad and the orange gel providing a speed boost. Unlike the stationary locations of gel in ''Portal 2'', however, the paint gun allows the player to apply the gels to paint-enabled surfaces through the levels. The game also takes advantage of a cut part of the ''Portal'' series in Pneumatic Diversity vents/tubes, which were featured in early trailers for ''Portal 2''. They are used in ''Aperture Tag'' to move the player from level to level in order to make the transitions faster.Development
Eugenio Roman, the original organizer of the Aperture Tag Team, first began considering paint gun and gel concepts before the '' Portal 2'' game was released and when the gel components of the game were announced. It was stated that the concept of paint for ''Portal 2'' was first derived from the game '' Tag: The Power of Paint'', whose team was hired to work on the paint aspects of ''Portal 2''. After playing this precursor, Roman wanted to do more with the aspects of the game, especially the paint gun. The paint gun he ended up using for ''Aperture Tag'' was developed by another modder in the community. Roman asked the creator if he could use the device, was approved to do so, and made some modifications before releasing his own map utilizing it. After attending a Valve-hosted closed beta for the Perpetual Testing Initiative, Roman asked the employees if a paint gun add-on was going to be developed for ''Portal 2'' so that it could be used in community made maps. They responded that while a weapon_paintgun file was in the game, it didn't do anything and had been dropped from the release entirely. Roman paid a visit to Valve in May 2013 and decided afterward to make ''Aperture Tag'' a full modification release and not just a series of episodic maps. The game's soundtrack was composed by Harry101UK, and Christopher McEvoy, and also included the song "All These Walls" by Abarax. Many of the tracks are remixes of tracks in the soundtrack of ''Portal 2''.Reception
ValveTime stated " perture Taglooks great, it plays well, and it last 2–3 hours. Giving it good value for money." ValveTime praised the visual and level design for its gameplay mechanic and variety, level design structure, polish degree, soundtrack detail consistency and map scale without affecting performance. However, they also criticized the pacing of the story and dialog falling weak many times. ''References
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