Mortal Coil is similar to many other puzzle apps: there is a tilt-maze aspect combined with a topology problem of filling in all the squares with one unbroken string.
200 easy levels
200 medium levels
400 challenging levels. Nobody has solved more than 390 of these. I've done 38 - in about 1.5 hours.
One of this blog's followers pointed this unknown app out to me. It came out in 2009. $1.99 is a bargain for this gem. Adam Miller & Erich Friedman are the brains behind this.
I think it's graph theory problem, not topology problem.
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