ReThink 3.5 is one of the first person puzzle games I made during the pandemic time, but could not release for a variety of reasons. I rebuilt the game in Unreal Engine 5, so that all the content that was in the game will not be wasted and is accessible to those who want to play through it. This also allows the game to utilize and benefit from all the other improvements that were made for the newer games, resulting in a better experience. As the Name implies, the game fits between ReThink 3 and 4 in terms of how the puzzles are designed, but it also comes with its own unique feature that is not in the newer games (yet). Content wise, there are more than 40 puzzles in the game, all built around the utilization of lasers and logic. On the technical side of things, the game comes with improved performance over the previously released ReThink games. Especially slower CPUs and Graphics cards should benefit from this*, while players with faster hardware also should see improved performance. Graphically, the games peaceful setting looks great on highest settings, while still looking like the older games (ReThink 1-3) on lower settings - retaining its compatibility with older hardware. (In fact, the rebuilt game runs a lot better than the original one would have.) *System requirements and the engines driver requirements still apply.