<iframe width="580" height="385" src="https://www.youtube.com/embed/XJ-8r9LFcwU" frameborder="0" allowfullscreen></iframe> <br>Try two puzzles. Invert the triangle in three moves. Move two pieces at a time in the line puzzle in three moves. <br><a href="https://www.youtube.com/watch?v=XJ-8r9LFcwU">source</a>
