As mentioned in today's review, the Mr. Hyde Build-A-Figure was based on his appearance in the Thunderbolts comic. Here's a piece of art from artist Declan Shalvey:
We don't blame the fans who think it's based on the mobile games, though, because here's how the character looked in Avengers Alliance 2:
It's not their fault they don't know the actual origin. That's why we're here: to help.
If you want to know what Hyde's "classic" look is, the cover of Amazing Spider-Man #232 is a good example of what fans were hoping for. And how easy it would be to turn this mold into that.