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Portal: Combined Technologies, also referred to as simply "Combined Tech", is a puzzle, story, and combat driven Portal 1 mod (recently being converted from portal 2)that links the stories of Portal and Half-Life using the concept of the "multiverse device" introduced in the PTI update to Portal 2. This mod will include partial custom voice acting for a couple new characters, plus modified in-game character voices for Cave Johnson and GLaDOS; various new weapons, new enemies, a custom story playing off both Portal 2 and Half-Life 2, and many other things.
Read the recent news article I posted if you wish to participate, it contains the guidelines