All right, this is one of those games I wasn't allowed to play while I was a kid because it has... uhm... erotic contents. It's Puzznic from Taito and it was released in 1989. Well... since we all were young once and never really listenend to such prohibitions, let's refresh our memories on this game which stands in the tradition of Strip Poker and the like. So guys, in order to catch the right mood, now lock the door, so mom won't enter your room while you play this game. As the name itself states, Puzznic is (of course) a puzzle game, so let's take a closer look.
If you you wait a few instants before inserting coins, you will be introduced with a demonstration on how to play the game. It's about some kind of mazes where we notice various multi-coloured blocks. In addition, to better keep them apart, blocks are also marked with different symbols like cubes, pyramids, cones, spheres and the like.

The trick is to place similar blocks one against each other, so that they disappear - this might look easy at the very beginning of the game. There's a statistics screen to the left, which keeps you informed on how many blocks of each type are still there in the current stage. That helps a lot since the easiest thing is to just couple two blocks of the same type... but you can't do that if you have three of the same type, since then one would be left alone and you'd lose, D'OH!
Coupling two blocks scores 100 points, whereas bringing together three blocks gets you 200 points. You score many more points by combining the disappearance of more blocks, similarly as in the game Columns (a coinop made by Sega): since coupled blocks disappear, the ones above them will fall below, and might couple too... and so on in a sort of "chain reaction" which scores a lot of points.

You'll sometimes find moving stones inside of mazes, on which you can put blocks, thus transporting them to a different place in the stage - this is something making mazes much more interesting! Notice that the game is ruled by the physical law of gravity so there is one general direction your blocks will move to: downwards!
You have to get rid of all those blocks to finish one stage and by doing so to uhm... well... uncover a picture in the background. In case you make some mistake, there are two "retries" (they work as lives in usual videogames) which allow you to repeat the last move. There is also a time limit to complete your job, and it varies from 30 seconds to 2:30 minutes.
The quicker you are, the more points you get: you get bonus points per each second left.

 Depending on the stage, bonus varies from 100 (at level 1) to 800 points (at level 4) per second. If you are very fast, like having over 30 seconds or one minute left, you'll get a fat bonus, which also gets more from level to level. Bonus is worth 10000 points at first, and it increases quickly. Also, the more points you get at the end of a stage, the quicker the picture in the background is revealed.
Pictures show us some uh... I guess Japanese gals (maybe some Chinese ones too), half naked. They have such luscious names like Tracy, Candy and Tina. There also is a course map (as seen in Darius) at the end of each level, where you can choose which way you want to go. Each level consists of 4 stages. After you finish the first eight levels the map won't appear anymore: you just keep on playing till level nine after which level number goes back to one. There are about ten different girls to be "uncovered".

And all you guys, don't forget those dip switches the way I always do. By operating them you can change a few game options like getting rid of those confusing naked pictures; "bombs" are another nice option: you'll be able to get rid of those blocks you don't know where to put at; finally, if the game is too hard for you, you can even change the number and effect of "retries" so that you wont only get to retry your last move, but the whole stage. Yes, the dip switches can be good indeed!
After two hours of puzzling I finished the map maze, and uh... seeing all there is to be seen, I think I can say that there is no ending to this game. There are quite a lot of stages with different approaches on the problem of getting blocks together.