The toolbar
The strip along the top is the same in every tab: files on the left, Undo and Play in the middle, modes and help on the right.

What each button does
| NutHouse | The logo, and next to it the name of your game. A dot in front (“• Chocobreak”) means there are changes you have not saved. |
|---|---|
| New | An empty game. ⌘N. If you have unsaved changes, NutHouse asks first. |
| Open | Open a .nuthouse file. ⌘O. |
| Save | Save in the same place. ⌘S. The first time it asks where. |
| Share… | Share as a web page. ⌘E. One file your friends can open in a browser. |
| ↶ Undo, ↷ Redo | Take back the last change, or put it back. Hover to see what it will undo, like “Undo Move object (⌘Z)”. |
| ▶ Play level | Play the level you are looking at. ⌘R. Esc stops. |
| ▶▶ Play game | Play the whole game from level 1. ⇧⌘R. |
| Simple / Advanced / Expert | How much NutHouse shows you. Changing it never changes your game. |
| 📚 Library | Search every sprite, tile, background and sound. |
| 🎮 Samples | Open a finished game to play and change. |
| ? | How NutHouse works: a short illustrated guide. |
| 🎓 Learn | Start the Chocobreak tutorial. It replaces the game you have open, so NutHouse asks first. |
How to save a copy with a new name
- Open the File menu at the top of the screen.
- Choose Save As… or press ⇧⌘S.
- Type the new name and press Save. The toolbar now shows the new name.
Under the toolbar: the tabs
Below the toolbar are Game, Level and Events. A fourth tab, Sprite editor, appears when you open a sprite or a background. See The Game, Level and Events tabs.