The bulk of the solutions come from deciphering codes, which felt like a bit of a missed opportunity to incorporate the player's surroundings into the puzzle-solving process, and they only get more dense as the game goes on. At one point after figuring out the key to getting into a locked van, I groaned out loud when I saw a periodic table of elements on the wall, realizing that it was part of the next puzzle. Some of the later puzzles work in more physicality and spatial manipulation, particularly the final level, which is reminiscent of "Portal" in how players must use the components of the puzzle itself in unexpected ways to their own advantage. It's something I would have loved to see more of throughout the game rather than just in its final act.