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# Level
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A level is a single exercise that should be solved by the user. Here is an example:
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```lean
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import GameServer.Commands -- also import everything else you need.
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Game "NNG"
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World "Addition"
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Level 2 -- must start at `1` and be consequtive.
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Title "add_zero"
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Introduction "" -- optional. Is displayed throughout the level.
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Statement MyNat.zero_add -- optional. if name is specified, the lemma will be added to the inventory in future levels.
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"description in mathematical term" -- optional. mathematical description
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(n : ℕ) : n + 0 = n := by -- statement: exactly how it would be in a `theorem`. (bug: forgets about implicit arguments)
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intro k
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rw [add_zero]
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Hint "look at {k}." -- hint at this place. `{k}` gets the user's name for the variable (bug currently)
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Hint (hidden := true) "more" -- hidden hint
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use n
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Branch -- A branch in the proof. Does not modify the goal but useful
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simp -- to place hints at dead ends etc.
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tauto
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rw [add_comm]
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rfl
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LemmaTab "Nat" -- optional. specify the tab that's open in the lemma inventory
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NewLemma add_zero -- optional. add lemma to inventory
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NewTactic rw -- optional. add tactic to inventory
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NewDefinition Nat -- optional. add definition to inventory
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DisabledLemma add_zero -- optional. disable specific lemmas
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DisabledTactic tauto simp -- optional. disable tactics
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OnlyLemma add_zero -- optional. disable all lemmas but these
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OnlyTactic assumption rw -- optional. disable all tactics but these
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Conclusion "" -- optional. Show when level completed
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```
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And in the following there are some tips that might be important.
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## Imports
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You're level can import levels from the same world
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```
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import NNG.Levels.Addition.Level_1
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```
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as well as entire other worlds
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```
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import NNG.Levels.Multiplication
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```
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However, you must not import a single level in a different world's level or
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it will mess up the World introduction texts (bug?)
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## Documentation (Lemmas, Tactics, Definitions)
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It will complain when the specified lemma/tactic names do not have documentation.
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In that case you need to add `LemmaDoc`/`TacticDoc`/`DefinitionDoc` entries in the
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doc part (and `ctrl+shift+X`-reload your file in VSCode). See info under `Game > Documentation`
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# World
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combines multiple levels, like a chapter. Description pending.
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# Game
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Combines different games in form of a directed graph. Description pending.
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## Documentation
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It is recommended to have all documentation for the inventory centrally and import it in
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the levels
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```lean
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LemmaDoc MyNat.add_squared as "add_squared" in "Pow"
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"(missing)"
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TacticDoc constructor
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"(missing)"
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DefinitionDoc One as "1"
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"(missing)"
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```
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Notes:
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* The lemma name must be **fully qualified**. The string display name can be arbitrary.
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* Tactics must have their proper name. use `TacticDoc «have» ""` if it does not work
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without french quotes.
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* Definition names can be arbitrary. E.g. I used `DefinitionDoc Symbol.Fun as "fun x ↦ x" "(missing)"` once.
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There will be features added to get automatic information from mathlib!
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