Music and Sound Effects

- Sound effects for shooting, getting hurt, dying, winning, losing, selecting a UI element, and walking should exist. More events may have sound effects if desired by the implementer.
- A soundtrack loop or ambient noise should exist for both the intermission and during subsequent waves. (See "Wave System" issue)
- **All music choices and sound effects must be free both in price and copyright. Artists for all tracks and sound effects must be credited in the credit box of the start menu** (See "Start Menu" issue for more details). Otherwise, the implementer is free to choose whatever sound and music they desire.