Kaitei Takara Sagashi is a 1980 Namco release that translates to Underwater Treasure Hunting. The player's goal is to lower a diver through shark infested waters to the seabed where a number of pots await. Controls are simple while diving – you descend automatically unless you hold the button, and pushing left or right allows you to fire your speargun in that direction.
Once all non-trap pots have been collected you advance to the next stage, with a new pattern of sharks and treasure pots.
The game is, unfortunately, monochrome with screen overlays to provide color. It's simple in design, and not too difficult to grasp. Trying to get a handle on the sharks' speed and overall pattern does provide a bit of challenge, as does the difficulty in hitting them with your spear.
Are the pots containing death traps unfair? Absolutely. As far as I can tell they shuffle every stage and show no hints as to which will kill you.
I give Kaitei Takara Sagashi a C rating.