From: United Kingdom
I have only recently discovered your web site and IOS apps and I am now wondering how I survived all those years without them. I am having immense fun trying to solve all your puzzles at all levels.
However, for the harder ones, I would find it very helpful if you could work in some way to checkpoint a puzzle at a given point and then be able to revert back to that checkpoint after solving the puzzle and seeing where a given choice took you. In fact I would really like to be able to save three or four checkpoints as sometimes one level of 'what if?' isn't enough.
I am currently simulating that functionality by noting down where I made a 'what if?' choice and then using the undo button when I find it leads to a dead end which works very well until I have to stop and save the puzzle and then I lose all the backtracking information when I next resume it.
I know I can always save the puzzle as a single checkpoint, but that is only one checkpoint and I would lose all the timing information every time I reloaded it.
Is this possible?