major props to hal lab for avoiding cashing in on yearly picross 3d releases like in the 2d series; round 2 is a complete overhaul of the original concept. the original picross 3d struggled with integrating its 3d nature into the actual puzzle solving, as the game's loop involved slicing its three-dimensional voxel sculptures into two-dimensional slices, where row hints pointing towards the player had next-to-no bearing on the solution of any given slice. round 2 instantly solves that by transforming the game's mechanics into an adaptation of color picross from the main series, where instead of chiseling out a monochrome image, you instead have to deal with multiple colors on each line. hints perpendicular to a slice now show the possible colors for that particular block, and thus the loop now involves checking hints on all three axes instead of just the slice's primary two. switching to colors also vastly increases the potential number of hint arrangements. as in the first game, each hint may indicate an unbroken string of blocks, two separate strings of blocks, or three+ strings of blocks, but now each of the two colors can have its own variable number of strings per row. the amount of different idioms that arise from this far surpass the original game.

what makes this particular interesting is that the coloration of the blocks is not random or chosen purely mechanically: it actually reflects the construction of each puzzle. the voxels of the original game are now marked blue, and new, variably shaped, curved blocks are marked orange. this addition adds substantial context to the chiseling process: compared to the rectangular jumble of the original, you can now clearly make out the structure of what you're building over time. while aesthetically pleasing in its own right, this also assists with the mental leg work, as educated guesses can be made much more easily with a rough idea of the puzzle's shape and edges. this creates some pseudo-idioms in its own right as well: for example, edges with a taper at either end generally appear as a single blue string and then two one-block orange strings. the game can get quite inscrutable at times without some real brute forcing of all the different possibilities, so the organic natures of the game's mechanical structures eases some of the tedium and allows for some guesswork.

I played a couple more rounds of the original just to feel it out, and honestly playing this has dampened my enthusiasm for that entry. so many QoL additions here, from the ability to swipe across the screen to break/paint a bunch of blocks in one go to finally being able to isolate the edge-most slice from any direction. the structure here has been changed from tiered assortments of puzzles from easy to hard to thematically driven "books" of puzzles, with the easy/normal/hard selection individualized for each puzzle. goes a long way in making the on-ramp smooth coming out of the original; no need to slog through the piss-easy stuff if you already have some experience with the concept. the ranking system is also much more granular, with your amount of misses (now including incorrect painting, unlike the first title) and time taken now converted to a numeric score, which gets multiplied against the chosen difficulty of the puzzle to get your final score and rank. also a testament to how difficult this game can get: later puzzles can have top "rainbow" ranks allow for 25-30 minutes on a single puzzle with up to three or four misses. the very final puzzle in the game took me over 45 min!