Set the diagram settings:...

Set the diagram settings: Time mode = Synchronous, Interval = 1, Run length = 1000 steps.
Create a Pool node. Name it Energy. Set its starting resources to 100.
Create a Pool node. Name it Coins. Set its starting resources to 0.
Create a Pool node. Name it Shields. Set its starting resources to 0. Set its Capacity to 3.
Create a Pool node. Name it Level. Set its starting resources to 1.