# Level Up Listener
The {ref}`Level Up Listener` is a tool that allows you to listen for
the level up messages and run `OnMessage` callbacks which should be thread safe.

You can debug incoming level up messages by adding this compiler directive
before you include WaspLib:
```pascal
{$DEFINE WL_DEBUG_LEVEL_UP_LISTENER}
```

For more information on listeners and how to run them check {ref}`Listeners`.


- - -

## LevelUpListener.LeveledUp
```pascal
function TLevelUpListener.LeveledUp(img: TImage): Boolean;
```
Very similar to the start of `Chat.LeveledUp`.

Basically looks for a message containing "Congratulations" at the start and
returns true if it's found.

Example:
```pascal
WriteLn LevelUpListener.LeveledUp(Target.GetImage());
```


- - -

## LevelUpListener.Check
```pascal
function TLevelUpListener.Check(): Boolean;
```
Returns true if there's been new messages.

Example:
```pascal
WriteLn LevelUpListener.Check();
```


- - -

## LevelUpListener variable
Global {ref}`TLevelUpListener` variable.