Now that I've finally mastered this hold I have to agree with the others. This hold is terrific. Here are some things that really stood out to me (i.e. why you should download and play this if you haven't yet.)
First, the puzzles are fantastic. There are some seriously devious puzzles here and they run the gamut from monster movement, to deep understanding of game mechanics, to classic lynchpin. There are some collections of rooms that follow a certain theme, but on the whole, there's enough variety to keep things interesting and the whole hold is on one level with a 5 by 5 open design allowing you to jump around to another room if you ever get frustrated or stuck.
The level design is just fantastic. The puzzles themselves are very solid, but the overall design aesthetics of this hold stand out. The abstract, and slightly disturbing minimap art feels like something you would see in TSS. I can't emphasis how much the attention to details like this add to a hold. It makes things a lot more immersive and fun to play.
My absolute favorite aspect of this hold is the secret rooms. This hold, takes the style of secret room from Shattered Mine and runs with it. The secret rooms are all easy to spot, but quite tricky to get to. 1N3E is a particularly good example of this and ranks up with MoAR for roach queen movement puzzles. This adds a lot of replay value to the hold as you essentially have to solve a new puzzle to access the secret rooms.
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