Random with memory

[FloresSottile]

I'm working on a game that helps kids develop math quickness in times table exercises and I'm trying to figure out what's the best approach to put on screen exercises randomly but with memory, so that every round a new exercise appears, but its multiples are different than the ones in the previous rounds, until all numbers have appeared as a multiple (2, 3, 4, 5, 6, 7, 8 and 9). The idea is to make rounds not repetitive and to let the kid be able to work with all tables from 2 to 9 in a short amount of rounds.

I tried with arrays but it wasnt efficient enough and it took too many lines.

Any ideas?

 

[Homunculus]

You could precompute in advance the order of the multiples instead of keeping track of randomized values.

In short, add all numbers to a ds_list, shuffle the list, and either remove one number at a time until empty or move through the list

 

[FloresSottile]

You could precompute in advance the order of the multiples instead of keeping track of randomized values.

In short, add all numbers to a ds_list, shuffle the list, and either remove one number at a time until empty or move through the list

You're totally right and that did work. Thanks !