| bx_audio | Type for an audio soundtrack |
| bx_color | Type for colors supported by the system |
| bx_dir | Type for opened file directories |
| bx_image | Type for images and sprites |
| bx_key | Type for snapshots of instantaneous state of the whole keyboard |
| bx_mouse | Type for for snapshots of instantaneous state of the mouse |
| bx_window | Type for top-level windows |
1.5.6