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> The game's developers describe them as "breedable Beanie Babies", each with its own unique 256-bit genome.

> The kitties' unique DNA can lead to four billion possible genetic variations.

Erm 2^256 is juuuuust a bit more than 4 billion. This seems like an error.

You're off by about 68 orders of magnitude; it's 2^32 that's approximately 4 billion.

This is what the person you are replying to was pointing out, yes, using sarcastic understatement.

Really thought that 5th 'u' in juuuuust would have implied the sarcasm tag

Six is the minimum.