Got diagonals working in Minigame. Got minigame back up and running. To get to it, press the select switch and then reset switch. Got 'ping' varying in volume like a real sonar (maybe, tell me what you think). Slight bug in that if you press the select switch in the "GOSUB" title screen, you can't get it back to 0. So just restart the emulator to change between game 0 & 1 (sorry. )Here's some simple instructions:

to exit minigame, press select switch

to exit game over screen in minigame, press reset switch

to start minigame, press fire

I'll work on this later today and hopefully have an updated version tomorrow.