It is a dexterity game for two players, where you are stacking disks that are part of a pyramid wall onto the top, making the wall grow skinnier and skinnier while the tower on top grows higher and higher.
The clever bit is that the wooden box that it comes in is also a marble ramp. At the start of the game, the marble is dropped down and the first player must make their move and catch the ball before it reaches the bottom. Then they drop it back in the top and the next player must make their move and catch the marble.
And believe me, that clever bit totally makes the game. Without the marble ramp, Wallimoppi would be a rather uninspired stacking game. With it, it has a great tension that makes playing it fun and exciting.
And every time I played Wallimoppi, a good time was had by all. A couple times, I took it to parties and it saw constant play.
So why'd I get rid of it?
Space was a factor. It's not a particularly large game but the wooden shoe box shape of it made it tough to stack on the shelf. And the marble ramp could be fiddly. You had to make sure it was set up right.
But the real reason is because it's just not a game that I will play very often. And when storage is an ongoing concern, sometimes you have to make those calls. I don't play a lot of dexterity games and one for precisely two-players is even more limiting. Elk Fest scrapes in by being small and flexible (and super cute) Wallimoppi doesn't have those same advantages,
Still, as I said before, Wallimoppi does what it does very well. I wouldn't turn down a game and I'd recommend to folks who like two-player dexterity games.