This app was mentioned in 8 comments, with an average of 10.25 upvotes
This good time wasting game for anyone interested. Untying Knots. There's different packs you can buy that are different items to untie.
App Name: Knot Fun
https://play.google.com/store/apps/details?id=com.StoxBox.KnotFun&hl=en
Are there any apps that give you a knot, then let you drag the strings to untie it? It'd keep my knot-loving girlfriend busy for days.
She doesn't need this app because she doesn't need a reference to tie the knots. She just loves untying them. You know when fishing line gets so knotted up that you just cut it? She'll happily spend 15 minutes untying it.
Edit: I found this one: https://play.google.com/store/apps/details?id=com.StoxBox.KnotFun&hl=en
My quick spiel (x-posted from r/unity3d):
Did untying that ball of christmas lights leave you unsatisfied and wanting more? Do you look forward to pulling your headphones out of your pocket in a jumbled mess? Then this game is for you! It brings knots into the future and into your pocket wherever you go! It's Knot Fun!
Available for free on Android and iOS!
Some more screenshots: http://imgur.com/tpDNKxi.png http://imgur.com/XBmucGS.png http://imgur.com/ltJED3e.png
There is a game that does this called Knot Fun. He posted it here not too long ago.
This app is for you.
https://play.google.com/store/apps/details?id=com.StoxBox.KnotFun&hl=en
Try this one: Knotfun
Fun time wasting game
Can't tie/untie your shoes yet? Then try this. I'm almost getting good enough to the point where I can leave the house. https://play.google.com/store/apps/details?id=com.StoxBox.KnotFun&hl=en