Gonzalo Alvarez and Will Rogers grew up playing trading-card games like Pokemon and YuGiOh. Now, with third creator Grace Chadwick, who is a freelance artist, they have a game of their own – Nawalli.

The Aztec civilization, flourishing in central Mexico from the 14th to the 16th centuries, was rich in mythology and religious traditions. Their pantheon of gods and goddesses governed every aspect of ...