>> At the moment I can't make head or tail of it.
Thats the problem I had at first, but once I realised that by finding the hidden numbers or doing certain things you were completing the tasks.. I kinda got a bit addicted.
lmao.. more so that I thought I was stuck so I clicked the "hints" button only to find out that was one of the 'achievements' too.
Oh well it kept me amused for about 20mins