Platzy

Materials: The five Platonic solids as dice (d4, d6, d8, d12, d20).

Gameplay
Each player rolls all five dice and may re-roll up to two times per round.

Upper Section
Categories: Ones, Twos, Threes, and Fours.
Bonus: A bonus of 50 points is awarded if the total score in the upper section is at least 30 points, which corresponds to three Ones, three Twos, three Threes, and three Fours.

Lower Section
The following categories are similar to Yahtzee:
Pair
Two Pairs
Three of a Kind
Four of a Kind
Full House
Chance

Special Category
Platzy: Five of a Kind (all dice showing the same number), worth 50 points.

Instead of the normal straights, Platzy features two new straight categories:
Arithmetic Straight: At least three dice with a constant difference (e.g. 2+4+6=12).
Geometric Straight: At least three dice with a constant ratio (e.g. 1+2+4+8+16=31).

Additionally, there are two number-theory-based categories:
Primes: The sum of all dice showing prime numbers.
Composites: The sum of all dice showing composite numbers.

Winning Condition
The player with the highest total score wins.

—description from the designer