Kaitei Takara Sagashi

Kaitei Takara Sagashi is an arcade game that was originally developed by K. K. Tokki as a prototype and later sold to Namco in early 1980, where it was completely rewritten and became the second of the three monochromatic titles released by the company for arcades during the early part of the year - the first was Navalone and the third was SOS.

Gameplay
Use the 2-way joystick to direct the boat across the surface of the ocean, then press the Firing Button to lower the diver down to the bottom of the ocean while watching out for the sharks swimming across the screen - at this point, you can hold the Firing Button down to pause the diver's descent and push the joystick in either direction to fire a harpoon at the sharks for 30-300 points. Once the diver has reached the bottom of the ocean, push the joystick in either direction to make him walk towards the nearest treasure cache to him (the boat will automatically follow his movement at this point). When the diver is directly over a treasure cache, the boat will lower him into it; the amount of points you will receive when you make it back to the surface of the ocean (which can range from 50-250) will then flash up on the screen. The boat will then raise the diver back up to the surface of the ocean - once again, you can hold the Firing Button down to pause the diver's ascent and push the joystick in either direction to fire a harpoon at the sharks. Once you have made it back up to the surface of the ocean, you must repeat the entire process for each of the four remaining treasure caches before the game proceeds to the next round.

Version differences

 * The K. K. Tokki version starts up immediately when the power is turned on, while the Namco version does a "RAM test" that is typical of their 8-bit arcade games.
 * The K. K. Tokki version features the attract message "INSERT COIN" on its title screen, while the Namco version features the attract message "DEPOSIT COIN".
 * The K. K. Tokki version measures the player's score in American "dollars", while the Namco version measures the player's score in more conventional "points".