Mortal Shell 2 ベータ: 実施はあったか

Mortal Shell 2 のベータ状況。発売前テストの確定情報、Advanced Editionビルド、公開ベータが未検証である理由。

状態: Unconfirmed更新日 Aug 29, 20265 分で読了ゲームバージョン: Launch build + Balance Patch 1 (PC live, console following)

かんたんな答え

公開ベータは公式ソースのいずれも確認していません。発売前ビルドはプレスとクリエイターに配布され、あるクリエイターは3週間のアーリーアクセスを得ていますが、それはオープンベータではありません。

このページの本文は英語です。長文のローカライズは進行中です。上の簡潔な回答は翻訳済みです。

Was there a Mortal Shell II beta?

Yes — an open beta is confirmed. This page previously said otherwise; the Balance Patch 1 notes settled it. The developer patch discussion explicitly refers to bringing the experience "back in line with the game's open beta", which is direct confirmation from the developer that an open beta ran.

What is still open is everything around that beta: its dates, its platforms, and whether sign-ups were public. Those remain 未確認.

Confirmed: pre-release creator access

A content creator's beginner guide states directly that he had been playing Mortal Shell II for three weeks before release and had received early access thanks to the developers. Separately, a community thread describing a complete playthrough refers to finishing the game through Advanced Edition access.

That is creator/press access, which is a different thing from a public beta — see the distinction below.

Four terms that get conflated

This is the most important part of the page, because "beta" searches collapse four different things:

Term	What it means	Mortal Shell II status
Open beta	Public pre-release test, usually open to anyone	Confirmed
Advanced / Early Access	Build given to press, creators or partners	Confirmed
Demo	Cut-down slice of the shipping game	TBD
Steam beta branch	Opt-in test channel inside Steam Properties	TBD

An open beta is not a demo. Advanced Edition access is not an open beta. Collapsing these is how "Mortal Shell II demo" ends up on a page where no demo exists.

Steam betas vs game betas

If you see "beta" on a Steam page, it may refer to a Steam beta branch — an opt-in build channel in the game's Properties menu — rather than a pre-release test of the game. Those are different things, and participating in a beta branch can break your save. 未確認 whether Mortal Shell II offers one.

Why the beta question matters now

Mortal Shell II released on August 20, 2026 as a complete premium game on PC, PS5 and Xbox Series X|S, so the beta question is historical. The live questions are about patching:

Balance Patch 1 has already shipped, covering economy changes, boss and enemy nerfs, and weapon and Tarstone buffs, on both PC and console. Four of the five core progression systems were adjusted within the first week of launch.

If you are looking for a way to test balance changes before they hit your save, that is what a beta branch would provide — and we have no evidence one exists. Treat it as 未確認.

"Beta branch" is not the same thing as a beta

This is the most common source of confusion, and it is worth separating cleanly:

A beta branch is an opt-in build channel inside Steam: right-click the game, open Properties, find the Betas section, and choose a branch from the dropdown. It lets a developer push test builds to players who opt in.
A game beta is a pre-release test of a game that is not out yet, usually with keys or an application process.

Searching for "Mortal Shell II beta" mostly surfaces the first kind by accident. Whether Mortal Shell II offers a beta branch on the shipping build is 未確認 — we have no verified evidence either way.

Beta branches are test builds. They can break saves, roll back progress and desync from the live version. If a branch ever appears for this game, do not opt in on the save you care about.

A larger patch is already in testing

The Balance Patch 1 notes state that a larger update is in testing. That is the most concrete forward statement we have, and it means the meta on this wiki will move again soon.

Every page affected by patch changes carries a "last verified" line for exactly this reason. When the next patch lands, the Shell, weapon and boss pages are the ones to re-check first.

What we would expect from a future test

Based on how Cold Symmetry and Playstack handled launch, future tests or patches are most likely announced through the official Steam page, the official website, the official Discord or the community subreddit — the same four channels that carried the launch messaging and the Balance Patch 1 notes.

What pre-release players told us

The creator who had three weeks of early access produced the most detailed systems guide available, and it is the backbone of several pages on this wiki. The parts worth repeating:

Shells are found in the world and cost three or four Glimpses; the cheap ones first.
Glimpses appear finite in a single playthrough, so the Shell you bond first matters.
Skill points are shared and refundable, which is the opposite of Glimpses.
Weapons have no scaling — only movesets and infusion compatibility separate them.
Tarstones level through combat XP and need Tar Core for their third tier, which only drops from levelling other stones.

Should you wait for a beta?

No — the game is out, patched, and sitting at Mostly Positive on Steam with roughly 78% positive across about 5,608 reviews. There is nothing to wait for.

If you are worried about the known technical problems — camera spinning, lock-on drift — they are documented on the Crashing page with the workarounds players report, and they were expected to be targeted by patching.

How to follow future tests

When official pre-release tests are announced, they come through the official Steam page, the official website, the official Discord or the community subreddit. Those are the channels this page watches, and the status line at the top will change from Unconfirmed the moment one is verified.

Still unconfirmed

The open beta's dates, platforms and sign-up method; whether a Steam beta branch exists for the shipping build; and whether the in-testing larger patch will include a public test. All 未確認.

The existence of the open beta itself is confirmed — it is the details that are missing.