I purchased this set for use in a non-standard way... Bear this in mind as you read my review. I have added my version of how I will be employing this set, below a review of the standard, designed approach for this product. Now for the review of the product, as it is intended to be used:
This set has nice wall sections, with/without torches ensconced in the walls, doorways, and openings. The wall sections are designed to interlock with posts, at the corners. It comes with its own floor system, which is designed to be pasted to foamcore boards. As designed, the system will work quite well. However, there is an issue with square posts being required in each corner, for the wall sections to interlock with. This is a minor quibble, but one I thought worth mentioning. Tabs on the wall sections will interlock in a slot on the corner sections, hence the need for the square posts, to create room for the wall tabs to interlock with something in the corners -- cuts are made in the corners of the square posts to allow the tabs on the wall sections to slide into the posts, hooking the two pieces together. This approach could be adapted to allow the wall sections to be pasted to 2mm-thick cardboard, as discussed below, but it would also increae the construction time, and effort, dramatically. The finished product would be far stronger, and also much heavier. I will leave you to experiment with this approach, on your own.
The system, as designed, will allow you to stack layers/levels vertically. It is a decent system, as designed, and I would highly recommend it, as such. However, expect to produce many, many pieces, to make a truly versatile, and useful, dungeon setup. You will need to wash-rinse-repeat, numerous times, ad nauseum, really, to get a useful set. This is true with ANY dungeon model system, including 3D printing of any type. Even if you went with a 2D product, you will have to make typically 100+ pieces for your chosen set, in order to have enough to make a typical dungeon. Just a word to the wise.
Now for how I will be using this product:
I will be using full-sheet label paper to print these out. I will then cut, peel, and apply them to 2mm-thick cardboard from the local picture framing shop. I will then be inserting these double-sided, cardboard wall sections, into a slot cut into foam floor pads, such as are used on the floor, in front of a work bench in a garage. I cut 1/4"-deep (6-7 mm deep) grooves into the foam pad sections, forming a 1-inch grid pattern (done using a Table Saw with an 120-tooth blade, with a narrow kerf). This allows me to make completely modular dungeon layouts using these wall sections inserted into the slots in the foam, end-to-end, forming rooms, hallways, etc.
Before cutting the grid pattern into the foam floor mats, I paint them with various shades of gray, white, and even some yellow and brown colors of craft paint, using a natural sea sponge applicator, to achieve a mottled paint pattern (painting technique borrowed from DM Scotty's YouTube video series of crafting dungeon tiles). The foam floor mats are naturally gray in color, they have interlocking edges which allow them to be connected to one another, which allows me to make any configuration needed. The mottled paint patterns create a varied floor surface, broken up by the upright wall sections, and doorways.
It is a great deal of work to create the wall sections, but once completed, I will have a completely modular system, infinitely adaptable, and re-useable for my lifetime, and my childrens'! It will be 2.75D, easy to store, and easy to transport.
My intended use will be for both miniatures gaming of dungeon crawls (using 2e's BattleSystem Skirmish rules, published by TSR, formerly available here, for PDF download), and occasional use for RPG's. I am planning to run G3 Hall of the Fire Giant King (1e), as a convention game, using miniatures, and these dungeon pieces, mapping out the entire first level, and possibly the second dungeon level, as well. These dungeon pieces will make that possible, along with the foam floor mats. It will be faster to insert the wall sections, into the mats, than it would be to interlock the wall sections, and mount them into foamcore floors. Cheers!