Factors and Multiples Chain

Click a number on the left to add it to your chain on the right — it lands in the next open spot. Click a number in your chain to send it back to the left. On a computer, you can also drag numbers within your chain to reorder them, or drag a number from the left straight into an empty spot on the right. A chain is any run of numbers, one after another, where each one is a factor or a multiple of the number right before it. Chains are highlighted in green — everything else stays blue. Play a few rounds and see if you can find a strategy that beats picking numbers at random. When you're happy with your best chain, click Submit to Leaderboard — it records the length of your longest chain only, never the actual sequence of numbers, so nobody else can just copy your answer.