leanprover-community/lean4game

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Server to host Lean games

Stars: 553
Forks: 105
Open beginner issues: 0
Indexed issues: 125
Avg merge: 1d 17h
Merged PRs (30d): 8

Dominant language: TypeScript
License: GPL-3.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

125 open issues indexed

The left-hand side bar scrolls to the bottom all the time Open

Difficulty 3/5 1-2 days Newbie friendliness 62/100

leanprover-community/lean4game#557 · Opened Sep 18, 2026
npm run translate cannot process some expressions Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

leanprover-community/lean4game#553 · 1 comment · Opened Sep 14, 2026
No v4.26.0 release tag, although the toolchain bump is on main Open

Difficulty 1/5 Under an hour Newbie friendliness 82/100

leanprover-community/lean4game#550 · Opened Sep 9, 2026
Previous and next buttons temporarily crash Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

leanprover-community/lean4game#549 · Opened Sep 6, 2026
Download yields empty .json Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/lean4game#538 · 4 comments · 3 reactions · Opened Aug 8, 2026
Variables appear unreadable in Robo game Open

awaiting-author bug priority-low

Difficulty 4/5 3-5 days Newbie friendliness 42/100

leanprover-community/lean4game#533 · 6 comments · Opened Jun 23, 2026
Don't show the same hint twice in a row Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 50/100

leanprover-community/lean4game#532 · 1 reaction · Opened Jun 19, 2026
(in NNG4) I run the game in local, after I complete Tutorial world(finish the first boss), I still can't continue to the next World. Open

bug not-reproduced

Difficulty 3/5 1-2 days Newbie friendliness 25/100

leanprover-community/lean4game#522 · 2 comments · Opened Jun 6, 2026
Language not persistent Open

bug priority-low question

Difficulty 3/5 1-2 days Newbie friendliness 52/100

leanprover-community/lean4game#520 · 6 comments · Opened May 27, 2026
Show definitions code in smartphone mode Open

fixed on dev

Difficulty 3/5 1-2 days Newbie friendliness 64/100

leanprover-community/lean4game#515 · 2 comments · Opened May 17, 2026
Editor mode add trailing newline for `unsolved goals` error Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

leanprover-community/lean4game#561 · Opened May 15, 2026
Do not let a level use itself in its proof Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

leanprover-community/lean4game#558 · Opened May 15, 2026
Links/references to game levels use folder names instead of world names Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

leanprover-community/lean4game#514 · Opened May 12, 2026
Home should show Level-Names on hover Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

leanprover-community/lean4game#559 · 1 reaction · Opened May 10, 2026
Rules Slider: Minimal Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

leanprover-community/lean4game#560 · Opened May 9, 2026
knights and knaves level 12 RPC Error: MethodNotFound Game.getInteractiveGoals Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#513 · 1 comment · Opened May 8, 2026
katex parse error: \hline valid only within array environment Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#506 · 10 comments · Opened Apr 21, 2026
Spurious level completion Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

leanprover-community/lean4game#501 · Opened Apr 21, 2026
First line of code from Natural Number Game-Algorithm world-level 4 cannot be executed in Safari Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#496 · 1 comment · Opened Apr 17, 2026
[feature-request] Darkmode Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#493 · 1 reaction · Opened Apr 7, 2026
support for multiple hints Open

duplicate feature

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/lean4game#482 · 1 comment · Opened Mar 21, 2026
statements now always displayed? Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#479 · 6 comments · Opened Mar 20, 2026
Bug: Web server hangs indefinitely on final tactic application in "First Real Limit" (Level 2/2) Open

bug duplicate

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#477 · 6 comments · Opened Mar 20, 2026
translatable Prerequisites Open

feature

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/lean4game#472 · 3 comments · Opened Mar 19, 2026
Possible regression: it is only a warning if a tactic is not available Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

leanprover-community/lean4game#463 · 7 comments · Opened Mar 9, 2026
Feature request: validate hint text references against proof context Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

leanprover-community/lean4game#460 · Opened Mar 5, 2026
Repeated spurious level completes in editor mode Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#453 · 2 comments · Opened Mar 1, 2026
Editor has stopped opening (Windows) Open

bug priority-high

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#451 · 9 comments · 4 reactions · Opened Feb 27, 2026
apply fails with no error leaving a grayed-out input box Open

bug priority-medium

Difficulty 4/5 3-5 days Newbie friendliness 42/100

leanprover-community/lean4game#446 · 1 comment · Opened Feb 14, 2026
Running locally: can't write answer (no typewriter) Open

bug priority-high

leanprover-community/lean4game#445 · 7 comments · 1 assignee · Opened Feb 8, 2026
Add ability to mark levels as optional Open

duplicate feature

Difficulty 5/5 Over a week Newbie friendliness 30/100

leanprover-community/lean4game#443 · 1 comment · Opened Jan 20, 2026
user code not saved Open

bug frontend priority-high

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#440 · 2 comments · Opened Jan 8, 2026
difficulty und inventory are not sent to server Open

bug frontend priority-high

Difficulty 3/5 1-2 days Newbie friendliness 48/100

leanprover-community/lean4game#439 · Opened Jan 8, 2026
Better error message when the server crashes Open

feature frontend

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

leanprover-community/lean4game#426 · 2 comments · Opened Dec 22, 2025
Give the game designer the choice between displaying "Goal" or "⊢" Open

feature priority-low

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/lean4game#420 · 1 reaction · Opened Dec 15, 2025
Real Analysis Description automatically scrolls down to the bottom Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#417 · 3 reactions · Opened Dec 10, 2025
Invalid escaping of translation strings Open

bug priority-medium

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#411 · 1 comment · Opened Oct 23, 2025
I'd love to play a Measure Theory/Probability, Real Analysis, or Theory of Computation version of this game! Open

ideal for volunteers not-applicable

Difficulty 5/5 Over a week Newbie friendliness 20/100

leanprover-community/lean4game#410 · 2 comments · Opened Oct 22, 2025
Workarounds needed to make `pnpm install` work Open

bug priority-low

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/lean4game#404 · 1 comment · Opened Sep 28, 2025
nonsense input leads to undefined state Open

bug not-reproduced

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#402 · 4 comments · Opened Sep 25, 2025
Inventory broken on mobile Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#401 · 3 comments · Opened Sep 25, 2025
Better handling of Lean errors Open

bug not-reproduced

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

leanprover-community/lean4game#400 · 2 comments · Opened Sep 25, 2025
feat: UI Suggestions Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/lean4game#398 · Opened Sep 23, 2025
incorrect placement of documentation Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/lean4game#390 · Opened Sep 18, 2025
chore: recover reorganised buttons (editor mode, rules) from dev Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 20/100

leanprover-community/lean4game#389 · Opened Sep 18, 2025
chore: recover improved chat panel from dev Open

feature

Difficulty 3/5 1-2 days Newbie friendliness 25/100

leanprover-community/lean4game#387 · Opened Sep 18, 2025
Remove `«` from strings Open

priority-low refactor

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/lean4game#379 · Opened Sep 13, 2025
Move mobile inventory next to command line Open

bug design feature

Difficulty 3/5 1-2 days Newbie friendliness 48/100

leanprover-community/lean4game#376 · 2 comments · Opened Sep 9, 2025
Bug: error not shown in `have := by` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

leanprover-community/lean4game#373 · 5 comments · Opened Sep 5, 2025
Meta Feature Request: Hint control Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

leanprover-community/lean4game#371 · Opened Sep 5, 2025

leanprover-community/lean4game

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