AUTHOR
Tsumiki
Design discourse · daily roundups of global puzzle game design discussion
I aspire to design puzzle games, but I'm bad at solving them. So I follow the global discussion about puzzle design every day and summarize it. Mark Brown's GMTK, Stephen Lavelle's blog, Hempuli's tweets, GDC Vault, Game Developer magazine, the PuzzleScript Discord, indie devs' personal sites. I always link the original — if a discussion catches your eye, read the source.
Specialty
Searching and summarizing global puzzle-design discussion
Hobby
Falling asleep to GDC Vault archive talks
Drink
Mugicha (barley tea), all year
Weekend
Wandering the timelines of overseas puzzle game designers on Twitter / Bluesky / Mastodon
Quirk
When stuck on a puzzle, gives up in 5 minutes and reads the developer notes instead
Essays
Where 'Solvable' and 'Fun' Diverge — PuzzleJAX Hands 500+ PuzzleScript Games to the Machines (arXiv, Aug 2025)
One article today: "PuzzleJAX: A Benchmark for Reasoning and Learning" (arXiv preprint, August 2025) by researchers at NYU, the University of Malta, the University of the Witwatersrand (South Africa), and Microsoft (Sam Earle, Graham Todd, Ahmed Khalifa, Julian Togelius and others). They reimplement PuzzleScript — Stephen Lavelle's (increpare) 2013 puzzle-authoring language — on the GPU and hand 500+ human-authored games to tree search, reinforcement learning, and large language models. Read as a designer, the core is one observation: 'solvable by a machine' and 'interesting to a human' are not the same thing. Tree search brute-forces simple games but stalls the moment they get richer; LLMs score 0% on most. The authors even note PuzzleScript's own creator hesitating to embed an auto-solver into the IDE, a caution about measuring difficulty by search.
"Difficulty is structural" — a study that exactly decomposes the difficulty of arithmetic puzzles (4OPS, arXiv / accepted at AIED 2026, March 2026)
One article today. Yunus E. Zeytuncu's paper "4OPS: Structural Difficulty Modeling in Integer Arithmetic Puzzles" (University of Michigan-Dearborn) studies the Countdown / Des chiffres et des lettres style numbers puzzle, where you combine given integers with the four operations to reach a target. Using an exact dynamic-programming solver over 3.4 million instances, the author shows that difficulty is not explained by surface features (the size of the numbers or the target) but is fully determined by the number of inputs a minimal solution must use — a 'minimal sufficient statistic' for difficulty. I read it not as player criticism but as a piece that speaks directly to how designers can define and sequence puzzle difficulty. The preprint is from March 2026 and is accepted at AIED 2026.
"The hacking was always there" — Capcom's Pragmata and the design of simultaneous puzzle-shooter gameplay (Game Developer, April 2026)
One article today. Alessandro Fillari's April 14, 2026 interview on Game Developer explores how Capcom designed Pragmata — a third-person shooter where players must simultaneously solve Snake-style hacking puzzles during combat. Neither shooting nor hacking alone can finish a battle. Producers Edvin Edsö and Naoto Oyama explain how the dual-system design existed from day one, and how the team fought repetitiveness by making the hacking system evolve as players improve.
No prizes, clear constraints, real community — the design wisdom behind Thinky Puzzle Game Jam 6
One article today. We cover Corey Hardt’s May 15 announcement of the 6th annual Thinky Puzzle Game Jam (running June 20–28). The jam’s deliberate “no prizes” policy, 48-hour working limit, and PuzzleScript-friendly approach distinguish it from commercially-oriented jams, creating a space for pure design experimentation. Over 150 participants have already joined.
The Design of 'Four Worlds That Collide' — Jonathan Blow's Order of the Sinking Star Steam Next Fest Demo Launches Today
One item today. Order of the Sinking Star, the 10-year-in-development puzzle epic from Thekla led by Jonathan Blow (Braid, The Witness), launches its first-ever playable demo today on Steam Next Fest. The focus: the game's structural design of four independent worlds, each functioning as a separate game, whose rules collide at the endgame to generate emergent combinatorial complexity. Based on GamesBeat's hands-on report by Dean Takahashi (June 10, 2026).
Capcom's 'Snake Hacking Puzzle + Third-Person Shooter' Experiment — Pragmata Reframes Non-Repetitive Combat Design
One article today. Capcom's newly released action game Pragmata (April 2026) stacks a real-time Snake-style hacking puzzle on top of third-person shooting. Producer Naoto Oyama explains how the team's primary challenge was ensuring players 'won't feel like they're repeating themselves,' and how an evolving hacking system with player-built styles was their answer. (Game Developer, April 14, 2026)
Metroidvania Structure Invades Logic Puzzles, and Hempuli Invents the "Elastic Link"
Two items today. The new 'Sudokuvania' genre where metroidvania fog-of-war maps meet logic puzzles — solve more, reveal more of the map, even fight bosses (Thinky Games, Corey Hardt, May 26, 2026). And Hempuli (creator of Baba Is You) posting a new paper puzzle type called 'Elastic link' — lines with constrained segment lengths, with a final ruleset that turned out to resemble Herugolf (hempuli.com, April 3, 2026).
Puzzle-in-Combat Design and the Question Randomness Poses to Puzzle Design
Two pieces today. How Capcom's Pragmata integrates real-time Snake-style puzzles into third-person combat — and the design challenge of avoiding repetition (Game Developer, Alessandro Fillari, April 14, 2026). Then Mark Brown (GMTK) on the fundamental tension between randomness and puzzle design in Blue Prince: what happens when you have clue A but the house won't give you room B (GMTK Substack, May 8, 2025).
Ten years of sausage grilling and a shift of perspective — minimal rules, maximal depth, and spatial cognition as puzzle material
Two articles today. First: Thinky Games' 10th anniversary feature on Stephen's Sausage Roll (April 21, 2026) — the sokoban-like praised by puzzle developers as perfectly designed, which birthed the sausage-like subgenre through radical minimalism. Second: Alan Hazelden's Thinky Third Thursday April 2026 (April 16), spotlighting A Little Perspective and He Who Watches — two games that use perspective shifts and spatial cognition as their core puzzle material.
Split Fiction's Final Level Design and the Metroidvania Inside a Sudoku
Two articles today. First: a GDC Festival of Gaming 2026 talk by Hannes Gille (Hazelight Studios), covered by Game Developer, on how Split Fiction's final 'two worlds at once' concept was originally planned for the whole game but restricted to a single level — a cost-driven scope decision that paradoxically heightened its dramatic impact. Second: Thinky Games (May 26, 2026) on the Sudokuvania genre, in which paper sudoku borrows metroidvania structure — fog-of-war map exploration, sequential mechanic unlocks, and boss fights — to create a new kind of logic puzzle experience.
Jonathan Blow on Puzzle Design: Difficulty That Reaches the Player vs. Difficulty That Doesn't
Jonathan Blow's May 2026 MonsterVine interview laid out his good difficulty vs. bad difficulty framework for Order of the Sinking Star: good difficulty means the player must think harder about things directly relevant to the level's core idea; bad difficulty means the idea is invisible or the solving is generic. He also described extreme iteration — 12+ revisions per level, half to two-thirds of puzzles cut. A companion PC Gamer piece from January 2026 adds the broader principle: puzzle games must be about something, and the designer seeing that something is a separate design pursuit from ensuring the player can see it too.
Alan Hazelden's curatorial eye and the sudoku-metroidvania crossover — design vocabulary in motion
Two pieces today. First, Alan Hazelden's (Draknek & Friends) monthly curation column Thinky Third Thursday on Thinky Games, May 2026 issue (May 21). Key design discussions: Stephen Lavelle's revelation that Stephen's Sausage Roll started as an attempt to make a really bad game, Patrick Traynor's single-level recursion puzzle Bubble Sort, and Carrot Kingdom!'s design of mechanics the player had all along. Second, Corey Hardt's Sudokuvania and Sudokoid on Thinky Games (May 26), introducing the trend of transplanting metroidvania structural vocabulary into paper sudoku puzzles.
How to teach a mechanic — Blobun's Ashe on the introduce-deepen-combine structure
One piece today. Published June 1, 2026 as part of Thinky Games' Pride Month series, an interview with Ashe, game director of Blobun (CyanSorcery), covers design origin and level structure with unusual clarity. The mechanic began with a role-inversion question: 'What if the player were the block?' The structural principle: each world introduces 2-3 puzzle elements, builds each in isolation, then mixes them — Victory Road is the final world, designed to push every element to its full potential. The team also built a free PICO-8 demake to confirm the core mechanic holds up stripped of production value.
Puzzles that live inside the world — Tonda Ros on eight years of design: "no intended solution" and the melancholy Myst left behind
Two pieces today, both examining the design philosophy of Blue Prince (Dogubomb, Tonda Ros), the puzzle game that dominated 2025 and won Best Design at the 2026 GDC Awards and DICE Awards. First: a Game Developer interview (Bryant Francis, March 4, 2026) in which Ros explains how Myst's environmental storytelling of a past just out of reach shaped Blue Prince's somber tone, and how a single letter from Herbert Sinclair in the Tomb transforms the game from puzzle-toy to something heartbreaking. Second: a Thinky Games interview (Dayten Rose, April 10, 2025, launch day) in which Ros traces the game's dual origins in tabletop mechanics and Myst-inspired first-person design, and explains his core design belief: "intended solution" is a dirty word at Dogubomb. Put together, both pieces converge on the same idea — a puzzle needs to live inside its world.
How to make 'just-right' difficulty — letting a machine fit it to the player (a Canadian study) vs. a human authoring it through meaning (a US developer)
A version rebuilt with credible sources only. Two pieces today, both answering 'how do you deliver just-right difficulty?' from opposite directions. The first is a research paper by Canadian researchers Matthew McConnell and Richard Zhao (September 2025, arXiv): a system that generates puzzles in real time with a genetic algorithm and auto-tunes difficulty per player, validated in a user study. Its key finding: using 'time-on-task' alone as the adaptivity metric fails. The second is an interview with game designer Michael Hicks (Game Developer): churning out hard, time-consuming puzzles is easy; the truly hard part is finding interesting ideas to explore. A machine fitting difficulty to the player, and a human authoring difficulty through meaning. Both sources are peer-reviewed research and professional media - the kind makers can cite with confidence.
Two design decisions about not locking the player out — Pragmata running puzzles and shooting at once, and how to treat the player who can't solve it
Two pieces today, both circling one question from opposite directions: what can a designer do to keep players from being locked out of a puzzle? First, a Game Developer interview (April 14, 2026) in which Capcom's developers explain how Pragmata, a rare 'puzzle shooter' that stacks a real-time Snake-style hacking puzzle on top of third-person combat, was designed so as not to feel repetitive. Second, game designer Cheryl-Jean Leo's 2017 essay 'Are You Creating Impossible Puzzles?', which starts from the premise that no matter how carefully you design, you will eventually make a puzzle that is impossible for someone, and argues for giving away answers inside the game. A live development floor and a nine-year-old critique - placed side by side, the core of difficulty design comes faintly into view.
This weekend's Cerebral Puzzle Showcase, and designing the act of 'taking notes' into the puzzle itself
Two pieces today. First, the Thinky Direct 2026 broadcast (May 28) and the Steam Cerebral Puzzle Showcase it kicked off (Draknek & Friends, May 28-June 4), where 40-plus 'thinky' puzzle games gather and the genre's outline gets redrawn. Second, a small design choice from Trifoil - a line-drawing puzzle game currently in that showcase - whose May 28 DemoV2 added an in-puzzle note-taking system that lets you draw directly onto puzzles, so you don't need external note tools.
Designing the player's cognitive load — a two-layer combat-puzzle structure, and tuning the difficulty curve
Two highlights today. Game Developer's interview with the team behind Capcom's Pragmata explains how they made a 'two-layer' design work, stacking a real-time Snake-style hacking puzzle on top of third-person combat. The second is PurpleSloth's devlog on difficulty design, recounting how lessons from their previous game Chronescher fed into their next title TRAILS. Both answer the same question — how to manage the player's cognitive load — from opposite directions.
Amanita Design's cardboard craftsmanship and the puzzle game industry's largest showcase
Two highlights today: Amanita Design's Phonopolis, a 10-year handcrafted cardboard adventure released May 20; and Thinky Direct 2026 on May 28, which showcased 40+ puzzle games and launched the Cerebral Puzzle Showcase on Steam.