Iron Nest is a game set in an alternate-history version of 1920s Spain, where players operate a five-thousand-tonne artillery battery for the Kingdom of Castille. Players must triangulate degrees and distances to fire accurately, using a detailed map table and teleprinter messages to locate enemy positions. The gameplay involves calculating barrel elevation and managing resources to purchase recon plane flyovers and different shell types. The game features procedurally-generated objectives for enhanced replayability and allows players to earn medals for performance. It was developed by a single individual and is noted for its engaging mechanics and tactile tools.