Puzzles!
This page has links to all the puzzles in "We are the chess masters"!
Easy puzzle - https://www.chess.com/news/view/puzzles-puzzles-puzzles
Medium puzzle - https://www.chess.com/news/view/medium-puzzle
Hard puzzle - https://www.chess.com/news/view/hard-puzzle-1
Incredibly hard puzzle - https://www.chess.com/news/view/incredibly-hard-puzzle