As I said, lessons learned.
I miss the old days...
I'm tired and I'm typing to stay awake, let me have my moment~! ...on your birthday.
But yea, having this issue of people setting up bots to key farm is pretty depressing.
Another way would be to replace one single letter/number with a * and then explain what that means under the code, like:
And a real person would know that's a 3. A bot can't know that.
Still left with the possible issue of redeem cooldowns wish apparently has been an issue for awhile and makes you wonder how many old un-redeemed codes are around, heh.