"Just" a lot of fun

There are in this game, only one simple rule that dominates guarantees also late in the day, each player: At the arrow, which empties the glass!
The construction is stable, robust glass, the arrow rotates smoothly, fortitude is given! As unerringly and spills freely you fill the glass again, is safe from the "Lucky You" dependent. One can marksmanship but eg also increase with a funnel)