An impossible sequence of Tetris pieces.
121063
Mathematics of Tetris 2.0
149585
Game with 37 diagonally-oriented holes, 10 black pegs and 10 white pegs
70460
How can I solve the following sequence
114792
Mathematical strategy puzzle
91112
Rooks on a 8 by 8 checker board. Probability problem
37629
Combinatorial card game
106955
Algorithm for Determining Tic Tac Toe Game Over
104268
Confusion on how to solve this question about sequences.
148009
Mathematical Olympiad Treasures Problem 1.92 how does this relate to geometric sequence
109920
Ordered binary sequences of length n with no two consecutive 0's without using recursion
68882
Path to Combinatorics Problem [$1.11$]
831
Is it possible for this puzzle to be solved without the use of computational software?
132921
Counting problem, number of moves
4500
Brute force method of solving the cube: How many moves would it take?
86893
Show that it is impossible to list the rational numbers in increasing order
60385
How to solve this sequence $165,195,255,285,345,x$
134440
An unexpected application of non-trivial combinatorics