Built entirely using Codex + GPT-5.5 + agent-sprite-forge In just half a day, I created a Sengoku-era monster-catching RPG similar to Pokémon. Features include: - 4 maps (2 gyms + 2 scene maps) - 16 monsters, with evolutions totaling 27 forms - Starter selection, wild encounters, gym challenges, boss battles - Monster catching, leveling up, evolution, Pokédex, items, healing points - Auto-generated maps, characters, monster sprites, NPCs, gyms, and props - Custom background music and sound effects for different maps/battles From map design, collision, NPC dialogues, battle systems, monster stats, evolution lines, sprite art, to sound effects—all developed through conversations with Codex. The era of speeding up game development with just your voice is here. Game link in the comments.