Now that I've finished every achievement and had a few days to think these games over, I'll give a more detailed opinion on all eight entries.
Sawayama: This form of solitaire is most reminiscent of the types you'd play on a school or office computer just to kill a bit of time. The twist is simple, yet elegant - when the deck empties, instead of shuffling back, it becomes a free cell for the remainder of the game. Difficulty-wise, this is one of the easiest offerings in this collection, and made for a good warm-up going into the other games. As far as audio and visuals go, this one delivers a very nostalgic feeling. Great game overall.
Sigmar's Garden: This entry stands out as it's played using beads on a board. Only beads that are almost completely surrounded by empty spaces are accessible, and must be paired with other beads based upon the rules of the game. This one was also fairly easy, if I actually took the time to plan out more than a move or two ahead. A very satisfying game, especially if you manage to hit the center bead last (which was typically pretty trivial to do).
Proletariat's Patience: The first of two Russian-themed games, this one has you sort a bunch of stacks of cards into two groups: four sets of four face cards and four runs of 10-6, with a free cell that you need to manage carefully. Sequencing wasn't terribly complex here, but poorly planned usage of the free cell got me stuck quite a few times in a quick fashion. I really enjoyed the theming of this one, but it made a lot more sense in its original game, EXAPUNKS, which is where I first encountered this entry.
Cribbage: When I last checked the achievement stats, Cribbage had the lowest 100-win achievement clear-rate, and given just how different this game is than the others, I can understand why. In this one, you're trying to assemble scoring hands from four randomized stacks of cards, based on fixed scoring criteria (e.g., Starting Jack, runs/sets, 15/31 value). I found its puzzle rather interesting, but struggled a bit - I landed just under 50% winrate after 100 wins. Something I liked about this game was its histogram, which showed scoring of other players, and well as what deal number you were on. I wasn't terribly fond of the fact that you had to deplete all four stacks in order to get to the New Game button, but there was at least one or two games that I unexpectedly won on the last hand, so that probably raised my winrate overall.
Cluj: The second Russian-themed entry, Cluj has sort of an oppressive feeling coming mostly from its rather muted audio and visuals. Paired with learning the Russian-deck face cards (TKDV), it was certainly one of the more daunting games to learn and progress in. I did enjoy concept of every cell being able to be a free cell, but the hidden challenge of potentially winning without using it was interesting as well. Of course, this oddity made miss-clicks feel absolutely brutal, and I reset several times after doing so.
Kabafuda: Kabafuda is a Japanese-themed solitaire using numeric kanji instead of numbers on the cards. The goal is to stack four cards of the same kind in an empty column, which in-turn opens up a free cell in the top section. The difficulty setting (Easy is all four free cells already open, Expert is only one free cell open to begin with), seems like a complete red herring. The concept is that having access to more free cells makes the game easier, but in execution it felt like the freedom it granted only allowed me a bit more time before my mistakes caught up with me. In the end, starting on the Hard difficulty (only two free cells open) wound up feeling the easiest since it restricted me from making more egregious plays. In any case, I felt that if I lost focus for even a small amount of time, I'd swiftly wind up in an unwinnable situation. While these sound like complaints, I do have to state, for the record, that despite my gripes, this was easily my favorite entry gameplay-wise.
Shenzhen: Shenzhen I/O was my introduction to Zachtronics-style solitaire, and the first time I grinded out a 100-win achievement on this kind of game. Anyway, this Chinese-themed solitaire was inspired by mahjong tiles. Like normal solitaire, you're trying to get the numbered cards stacked by increasing sequence, but the twist here is that there are three sets of four distinct non-numbered cards that you want to stack into the three free cells at the top. It's not terribly hard to get stuck, so thinking more than one move ahead is rather important here. Notably, I found this to be quite a bit easier than Kabafuda, but that's likely due to my previous experience in the mode.
Fortune's Foundation: The crown jewel of this solitaire collection, Fortune's Foundation takes an already-difficult 4-suit spider solitaire and turns up the heat by throwing in a 22-card tarot deck to stack in order (from either end) next to it. This is the only entry that comes with an undo button, but its limited to exactly your last move. This game is a mental endurance test, and large portion of my played hours (as of the writing of this review) were dedicated to the 100 wins here. Each game really feels like a journey of its own, and the fact that you get a different tarot card reading depending on the last one played is a fantastic touch which significantly boosts replayability, and gives a fun extra goal of trying to manipulate the outcome with precise sequencing.
