I can only play HL1 entries.
Skals's entry was intriging. It was alright, but got me stuck sometimes not knowing what to do next.
I would especially like to compliment Zeeba-G's entry. I'm unable to put it into words. Everything was thought up to the smallest detail. His entry has undoubtedly earned first place, by far.
There was thing that got me confused however. Why is the fish tank a button that opens the stairs?