Played some arcade games. I didn't particularly care for Seicross, Shooting Gallery (Seatongrove), Snake Pit, Son Son, Speed Coin and Squash. They're all decent, except Speed Coin but that's a proto. Of these, Snake Pit I'd say is the best, get decently hectic too. Son Son is too manageable for how little variety it has, but is probably a bit more familiar.

Sea Fighter Poseidon is a horizontal shooter. You ride a diver propulsion vehicle with rockets that you can eject from in case of low fuel or it getting hit. You can shoot enemies off of theirs and then take it for yourself. There are some environment hazards (which do hurt enemies) and a boss enemy. Your actual goal is to save divers. Simple and not that much in the way of content, but good for a 1984 conversion kit.

Snacks'n Jaxson is a bit harder to define outside of "arcade". The clown bounces his nose (similar effect to those 3D pong games) and in between bounces you need to quickly get all the food items and receive the nose using your face. You'll have to watch out for soap and peppers as they'll stun you for a bit. After every day an obstacle is added to the room.

Spatter (picrel) is a rather cutesy maze game in the vein of Head-On. The gimmick is that you can jump into stretchy railings to avoid enemies. There's also some objects you can push into them. Your goal is to get all the flowers. The bonus stages are single-screen platforming levels instead.

Speed Attack is quite a bit simpler, but a rarity as it's a card game that isn't for gambling. You get 2 stacks of cards and you can put adjacent cards on them. If no moves are available, card(s) are taken from the players deck and placed on the pile. The gimmick is that it's real-time. The CPU does get really fast, but due to the win condition you can still win if you just have a good final hand.