If you want to dominate the global leaderboards and build the ultimate high score, you need to understand all Yukkuri forms Touhou Yukkuri Mountain has to offer. Released on May 28, 2026, by BeXide Inc., this 3D merge puzzle game takes the viral Suika formula and injects it with pure Touhou Project chaos. Instead of dropping generic fruits, you are stacking squishy, physics-enabled "Yukkuri"—the iconic, disembodied, carefree heads of your favorite Touhou characters. But unlike its predecessors, this game does not lock you into a single evolutionary path. With 30 different characters to unlock and the ability to completely customize your merge order, mastering the game requires deep knowledge of every character's size, weight, and hitbox.
Here is the definitive breakdown of the roster, the shop economy, and the physics exploits you need to clear the bowl and hit maximum chain combos.
The Suika Formula Perfected
BeXide Inc. didn't just slap a Touhou skin on a viral trend; they engineered a physics puzzle that actively fights back. Available on PC via Steam, Nintendo Switch, and the Nintendo Switch 2 (featuring higher-resolution graphics and GameShare support for 1,980 yen, plus a 162 yen upgrade pack for existing owners), Touhou Yukkuri Mountain demands precision.
The core loop is deceptively simple: drop a Yukkuri into the bowl. When two of the same kind touch, they merge and transform into the next size up. If any character overflows and breaks the top rim of the bowl, it is an instant Game Over. Complicating matters is the lively, fully voiced commentary from Reimu and Marisa, who dynamically react to your plays, and a chaotic, comedic soundtrack arranged by the B-SiDE sound team. To survive the local 4-player multiplayer battles or climb the online rankings, you must memorize the evolution tiers.
How to Unlock all Yukkuri forms Touhou Yukkuri Mountain
You do not start the game with the full roster. Unlocking the complete roster of 30 forms requires engaging with the Yukkuri Shop Economy. Every match yields points based on your final score and the complexity of your merges.
A standard drop that results in a single "Base Match 10pts" will barely move the needle. However, setting up a cascading sequence where multiple heads merge in rapid succession triggers a "Chain Bonus 50pts" per cascade, exponentially increasing your payout.
At the end of a run, these points are banked. You can then visit the in-game shop to unlock new characters to add to your rotation. Early unlocks cost a modest 2,000 points, but the final, most irregularly shaped characters demand a premium. You will need roughly 100,000 cumulative points to buy out the shop entirely.
Analysis Report Poster: Shop economy and point system for unlocking characters
Default Size Guide: all Yukkuri forms Touhou Yukkuri Mountain
Before you start messing with the custom loadouts, you need to understand the baseline. The default 11-Tier Yukkuri Size Evolution dictates how much volume each head occupies in the bowl.
Because these are character heads rather than perfect spheres, their accessories (hats, ribbons, ahoge) create jagged hitboxes that can snag on each other, leaving dangerous empty pockets at the bottom of the bowl.
Here is the default progression chart from smallest to largest:
| Tier | Character | Relative Size | Physics Quirk |
|---|---|---|---|
| Tier 1 | Suika Ibuki | Tiny | Rolls easily into gaps; heavy for its size. |
| Tier 2 | Rumia | Very Small | Near-perfect sphere; highly predictable. |
| Tier 3 | Cirno | Small | Jagged hair hitbox can snag on the glass. |
| Tier 4 | Chen | Small-Medium | Ear hitboxes create slight bounce on impact. |
| Tier 5 | Alice Margatroid | Medium | Smooth rolling, but wide base. |
| Tier 6 | Youmu Konpaku | Medium-Large | Asymmetrical weight distribution. |
| Tier 7 | Sakuya Izayoi | Large | Tends to wedge itself against flat walls. |
| Tier 8 | Remilia Scarlet | Very Large | Hat brim creates a massive dead-zone underneath. |
| Tier 9 | Flandre Scarlet | Massive | Irregular crystal wing hitboxes cause unpredictable shifts. |
| Tier 10 | Marisa Kirisame | Colossal | The witch hat takes up immense horizontal space. |
| Tier 11 | Reimu Hakurei | Maximum | Occupies roughly 60% of the bowl's width; crushes smaller forms. |
Infographic: size evolution of all Yukkuri forms Touhou Yukkuri Mountain
The 19 Unlockable Shop Characters
Once you begin spending your points, you can unlock the remaining 19 characters to swap into your 11-tier deck. The full unlockable roster includes:
- Embodiment of Scarlet Devil cast: Patchouli Knowledge, Hong Meiling, Letty Whiterock.
- Perfect Cherry Blossom cast: Lily White, Lunasa Prismriver, Merlin Prismriver, Lyrica Prismriver, Yuyuko Saigyouji, Ran Yakumo, Yukari Yakumo.
- Imperishable Night cast: Mystia Lorelei, Keine Kamishirasawa, Tewi Inaba, Reisen Udongein Inaba, Eirin Yagokoro, Kaguya Houraisan, Fujiwara no Mokou.
- Mountain of Faith cast: Aya Shameimaru, Sanae Kochiya.
Customizing all Yukkuri forms Touhou Yukkuri Mountain
The Custom Order menu is where the game transcends its genre. Unlike traditional merge games where a cherry always becomes a strawberry, Touhou Yukkuri Mountain allows you to completely swap the order of evolution.
Want Suika Ibuki to be the massive Tier 11 endgame goal? You can assign her to that slot. Want Marisa's giant hat to be the tiny Tier 1 drop? You can do that too. This customization radically alters the game's physics landscape.
However, you must build your deck carefully. If you set "Flandre Scarlet to Tier 11" and assign a similarly jagged character to Tier 10, the resulting merge will require massive horizontal clearance. Dropping a massive Flandre head directly into a crowded bowl without planning for her wing hitboxes will almost certainly result in an instant Game Over, leaving you with a pathetic "Score: 120".
Comic Grid: The dangers of customizing your evolution order poorly
The optimal strategy is to assign perfectly spherical characters (like Rumia or Mystia) to the mid-tiers (Tiers 5 through 8) where bowl congestion is at its highest, and reserve the wide-hat characters (Marisa, Remilia) for the tiny early tiers where their hitboxes won't ruin your late-game stability.
Advanced Strategies and Physics Exploits
If you want to survive the 4-player local multiplayer mode—where the physics engine is pushed to its absolute breaking point—you cannot rely on luck. You must exploit the game's unique quirks.
First, understand that these "carefree heads roll unpredictably due to uneven weight." A Yukkuri with a heavy side ponytail will naturally tilt and roll in that direction. You can use this to your advantage by dropping asymmetrical heads on slopes, forcing them to roll into hard-to-reach corners and trigger buried merges.
Second, "merging two identical forms creates a sudden upward physics burst." When two Tier 9 forms merge into a Tier 10, the new character violently expands. If this happens at the bottom of the bowl, the expansion will launch smaller Tier 1 and Tier 2 heads upward. Skilled players intentionally bury mid-tier merges under a layer of small heads to create a "popcorn effect," violently reshuffling the bowl when things get too tight.
Annotated Diagram: Bowl physics and merge mechanics
Finally, maintain your focus. The "Reimu and Marisa commentary triggers on large chains," and while their banter is charming, a sudden shout of excitement can distract you during a delicate drop. If you find the audio cues throwing off your rhythm, you can lower the voice volume in the settings while keeping the B-SiDE soundtrack intact. Remember, the "game over triggers if any form breaks the top rim" for even a fraction of a second. There is no grace period.
FAQ: all Yukkuri forms Touhou Yukkuri Mountain
What happens when two Tier 11 Yukkuri merge? Unlike standard Suika games where the largest fruits simply sit there and take up space, merging two Tier 11 heads in this game triggers a massive screen-clearing explosion. This grants a colossal score bonus and entirely removes the Tier 11 forms from the board, freeing up massive amounts of bowl space to continue your run.
Can I turn off Reimu and Marisa's commentary? Yes. While the live commentary is a major selling point, it can be toggled off or adjusted via the Audio Settings menu on the main title screen if you prefer a quieter puzzle experience.
Does the game feature online multiplayer? Touhou Yukkuri Mountain supports up to 4 players in local split-screen multiplayer, which is perfect for couch co-op chaos. However, online functionality is strictly limited to the global score leaderboards.
Do the Switch and PC versions have different physics? No. The physics engine is identical across the PC, Nintendo Switch, and Nintendo Switch 2 versions. The only differences are the rendering resolution and the Switch 2's exclusive GameShare support.
Sources:
- BeXide Inc. Official Press Release (May 2026)
- Steam Community Hub: Touhou Yukkuri Mountain
- Nintendo eShop Listing Details