Generally great Portal-like puzzle game. Surprisingly beautiful aesthetically for an older title. Story was unfortunately rather unsatisfying (the double fake out is a cute idea but it makes the climax rather unsatisfying. The entire story becomes a 'he said-she said' situation and it takes away from the mystery. However, you play these titles mainly for the puzzles, and ignoring some over-complex puzzles near the end it doesn't disappoint on that front.

If I had to rank the this along side the Portal games I think it would go something like:
4. Q.U.B.E: Director's Cut (7.5/10)
3. Portal Reloaded (8/10)
2. Portal 1 (8.5/10)
1. Portal 2 (10/10)