Dig Dug boots straight into attract mode. Click the screen first so it captures the keyboard, then insert a coin (5 or C) and press 1 (or 2 for two players) to start. Use the arrow keys to move Dig Dug and Space or Ctrl to work the pump. Sound is fully supported and plays during a real game; the page starts muted, so press the Sound button to unmute. Open the debugger to single-step the main Z80, read and write its registers and the 64K memory, and set breakpoints and write watchpoints.