Frasse - combination lock

[Kickaha]

I've got through the coloured tunnels to find a combination lock with a helpful sign above it which ends "use MAGIC". 

Well helpful when you know how to interpret it.  None of the ways I've tried so far work.

It might just be that it's one of those sums "OPEN + NOW = MAGIC" and you want the digits for MAGIC.  But there are a number of possibilities and to try each one is not a five second job.

[Trumgottist]

There is only one possible solution. Hint: Finding the digits corresponding to O, M and A is a good starting point.

[Kickaha]

Thanks Trumgottist!