Decide what will trigger the behavior. This could be an action like a collision, an interaction, or the game starting. Select a “Trigger” box and drag it into the editor.

Navigate to the “Game Actions” section, and select either the ‘Set Speed Multiplier’ or ‘Increment Speed Multiplier’ blocks. For example, you might select ‘Set Speed Multiplier’ and add a value of “2” to it, multiplying your character speed by 100% when entering the game.

Exit the Behavior Editor, playtest and ensure it works as expected!