leanprover-community/NNG4

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Natural Number Game

Stars: 374
Forks: 92
Open beginner issues: 0
Indexed issues: 36
Avg merge: 1d 18h
Merged PRs (30d): 2

Dominant language: Lean
License: Apache-2.0
Last GitHub push: Sep 10, 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

36 open issues indexed

Update Game.pot & translation files Open

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

leanprover-community/NNG4#171 · 2 comments · Opened Sep 10, 2026
minor feature request: a way to turn Fermat's Last Bubble green Open

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

leanprover-community/NNG4#167 · 2 comments · 3 reactions · Opened Aug 26, 2026
Natural Number World: Level 7 - `rw [one_eq_succ_zero]` doesn't expand `1` Open

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

leanprover-community/NNG4#155 · Opened Jun 21, 2026
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

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

leanprover-community/NNG4#153 · Opened Jun 3, 2026
le_antisymm hints Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

leanprover-community/NNG4#148 · Opened May 15, 2026
Better `≤ World 5th Level` hints Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

leanprover-community/NNG4#146 · Opened May 15, 2026
succ_mul level has a bad hint Open

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

leanprover-community/NNG4#141 · Opened May 9, 2026
No Goals and Level is not Completed Open

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

leanprover-community/NNG4#140 · 2 comments · Opened May 8, 2026
Escape sequences are missing from inventory right side panel Open

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

leanprover-community/NNG4#139 · 1 comment · Opened May 6, 2026
Power World level 5 doesn't allow rewrites Open

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

leanprover-community/NNG4#138 · 1 comment · Opened Apr 29, 2026
Explanation for rfl Open

bug lean4game

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

leanprover-community/NNG4#131 · 1 comment · Opened Mar 5, 2026
Unclear description of Algorithm World 7 Open

documentation

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

leanprover-community/NNG4#111 · 1 comment · 1 reaction · Opened Aug 8, 2025
A new out-of-the-box docker image Open

enhancement

Difficulty 1/5 Under an hour Newbie friendliness 35/100

leanprover-community/NNG4#110 · 3 comments · Opened Jul 31, 2025
Victory condition achieved when writing non sensical tactics Open

bug lean4game

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

leanprover-community/NNG4#103 · 6 comments · Opened Jun 26, 2025
Advanced Multiplication World 9/10 has an ambiguous hint Open

documentation

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

leanprover-community/NNG4#102 · 1 reaction · Opened Jun 19, 2025
add_left_comm is an unknown identifier in Multiplication World, Level 3 Open

bug duplicate

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

leanprover-community/NNG4#98 · 7 comments · Opened Jun 7, 2025
Introduce `have` and `induction … generalizing` early Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

leanprover-community/NNG4#97 · Opened May 31, 2025
cannot apply succ_inj in succ_mul Open

bug duplicate

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

leanprover-community/NNG4#96 · 3 comments · Opened May 20, 2025
hard world Open

new content

Difficulty 5/5 Over a week Newbie friendliness 15/100

leanprover-community/NNG4#91 · 1 comment · Opened Feb 15, 2025
advanced algorithm world Open

new content

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

leanprover-community/NNG4#90 · Opened Feb 15, 2025
prime number world Open

new content

Difficulty 5/5 Over a week Newbie friendliness 28/100

leanprover-community/NNG4#89 · 4 comments · Opened Feb 15, 2025
divisibility world Open

new content

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

leanprover-community/NNG4#88 · 7 comments · Opened Feb 15, 2025
missing `add_left_cancel` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

leanprover-community/NNG4#78 · 3 comments · Opened Oct 10, 2024
`le_zero` suggested proof contains symbol that is not mentioned Open

documentation

Difficulty 1/5 Under an hour Newbie friendliness 35/100

leanprover-community/NNG4#77 · 1 comment · 3 reactions · Opened Oct 9, 2024
succ_le_succ theorem description incorrect Open

bug

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

leanprover-community/NNG4#75 · 1 comment · Opened Aug 28, 2024
document `simp only` Open

documentation

Difficulty 1/5 Under an hour Newbie friendliness 45/100

leanprover-community/NNG4#72 · 1 comment · Opened Jul 3, 2024
document the difference between `contrapose` and `contrapose!` Open

documentation

leanprover-community/NNG4#71 · 1 comment · 4 reactions · 1 assignee · Opened Jul 2, 2024
differentiate unlocked theorems from axioms in theorem list Open

enhancement question

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

leanprover-community/NNG4#70 · 4 comments · Opened Jul 1, 2024
Power World 10 uses ≠ which we don't yet know Open

bug

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

leanprover-community/NNG4#68 · 7 comments · Opened Jun 21, 2024
The commentary uses `repeat` which isn't listed in the tactics Open

documentation

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

leanprover-community/NNG4#60 · 2 comments · Opened Mar 21, 2024
disappearing text in tutorial world entry page Open

bug wontfix

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

leanprover-community/NNG4#26 · 2 comments · Opened Sep 25, 2023
`rw`: wrong error message Open

bug

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

leanprover-community/NNG4#25 · 2 comments · Opened Sep 23, 2023
Add copyright notices to all files Open

documentation

leanprover-community/NNG4#24 · 1 assignee · Opened Sep 21, 2023
Add link to FLT resources Open

documentation

leanprover-community/NNG4#22 · 1 assignee · Opened Sep 21, 2023
Strong induction world Open

new content

leanprover-community/NNG4#10 · 15 comments · 1 assignee · Opened Jul 5, 2023
Even/odd world Open

new content

Difficulty 4/5 3-5 days Newbie friendliness 48/100

leanprover-community/NNG4#9 · 11 comments · Opened Jul 5, 2023

leanprover-community/NNG4

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