New posts in recreational-mathematics

The final number after $999$ operations.

How many ways are there to pile $n$ "$1\times 2$ rectangles" under some conditions?

Approximation of $e$ using $\pi$ and $\phi$?

A gambler with the devil's luck?

How to create mazes on the hyperbolic plane?

Suggestions for mathematical solitaire against boredom

Strange acknowledgment in Serge Lang's Linear Algebra

How to colour the US map with Yellow, Green, Red and Blue to minimize the number of states with the color of Green

Reverse engineering a math magic trick involving matrices.

limit $\underbrace{\lim_{n\to\infty}\frac1n+\lim_{n\to\infty}\frac1n+\cdots+\lim_{n\to\infty}\frac1n}_{n\text{ times}}$

Interesting Math for 3-graders

BIG LIST: Statements that look obviously false but cannot be disproved

Number of ways to stack LEGO bricks

Research Papers readable by undergraduates

Pattern in number of digits in $(10^n)!$

What is the best strategy for Cookie-Clicker-esque games?

Hat 'trick': Can one of them guess right?

Combinatorics riddle: keys and a safe

Expert Minesweeper Probability Question

The Definite Integral Problem (with a twist)?