My parents recently bought Arin this cool block puzzle. Today was the first day that we played with it (and of course the girls have aleady misplaced one of the blocks - grrr!!!). This puzzle was more of a challenge for Arin than I had expected it to be. Ella really wanted to play with it too. Last year, I came across this post on Chasing Cheerios, explaining how to make one of these puzzles. I am planning on making a four-block puzzle for Ella.