How to Beat Shroom and Gloom: Reaching The Gloom

What “beating it” means right now

In the demo, the goal is to reach The Gloom at the end of 26 handcrafted tunnels. The June 2026 update added a new ending event for players who get there. The speedrun.com leaderboard has the fastest recorded demo run at 16 minutes 5 seconds, which tells you the intended run length is short — losses come from a run collapsing, not from a marathon.

From September 10, Early Access adds a second route to The Gloom with its own card pool, so “beating it” becomes two different journeys rather than one.

The boss chamber, as shown officially

The boss screenshot is specific: a single 90 health boss under a giant cap, with four 5 health adds in front of it, each showing 3-damage attack intents or 3 block. That layout answers itself — the adds die to almost anything, and leaving them alive means taking 12 damage a turn while you work on the boss.

The player in that screenshot is at 26 of 40 health with 3 energy, holding ROAST, FORCED GROWTH, INVENTORS BLADE and a 97-use EVERLASTING TRUFFLE. That is what a late-run hand looks like: one reliable attack, one grown card, and a resource card carrying an absurd counter.

The four decisions that decide a run

Which card lands the kill. ROAST only makes a corpse TOASTY “if FATAL”. Healing comes from eating, so the last hit matters more than the total damage.
When you camp. CAMP FIRE adds WARMTH “to hold danger at bay”, and hazards decide whether a room is cheap or expensive to rest in.
How long you stay. Overstay and The Gloom takes you. Every extra reveal is bought with time.
What you grow. A grown starter beats a rare you cannot afford to play — see the builds page.

Where runs actually end, per the players

The Steam forum is candid about the demo’s failure modes: the difficulty spike on deeper floors, illness effects like psychosis stacking up, and curses arriving from reveals you paid for. One player reported a hard softlock — two doors after a boss, no energy, no playable cards, no way back. If a run ends that way, it is not you.

Team Lazerbeam’s own clarification helps here: enemies scale with depth, not with how strong your deck looks. If a floor is beating you, the answer is a stronger engine, not a more cautious one.

Combat guide — intents, FATAL, and the keyword list.
Enemies and bosses — every health value from the official screenshots.
Demo page — the 26-tunnel structure and what changes at Early Access.

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