Do you like a good codebreaker or crack the safe task? My first choice teacher for ideas is Alutwyche on TES Resources. Seriously, check out his amazing resources and follow him on Twitter (@andylutwyche).
Now the thing with ‘Crack the safe’ tasks is there will be a small group of students who everyone expects to win it. It doesn’t matter how long the code is, there can be an anti-climax when someone wins.
What if you could level the playing field or extend the challenge?
Introducing the ‘Lock out hasp’ – a common tool in the field of electrical safety. A very ingenious tool that you may want to look up. It allows you to add numerous locks to a puzzle – they could be differentiated solutions, they could be staged problems. The choice is yours!
Different hasps have different numbers of holes, different locks have different numbers of digits: the hardware store is your oyster!