Screenshot of Incremental Fortress 1.0

Incremental Fortress is an obscure game developed by Louigi Verona and then played by who knows how many people.

First public release was of version 0.3 on February 13, 2023, followed by version 0.4 and later a major release of version 0.5 on August 17, 2023. The game received mixed to negative reactions. Players disliked the messenger mechanic, as well as the Volcano Breathers mechanic with their reliance on the passage of real time.

After several major revisions, including reworking messengers and the Volcano Breathers, version 1.0 was released on February 7, 2025 to generally positive reviews.

The goal of the game is to increase the rate at which the game currency increases and ultimately reach the last transmigration upgrade. After this the game can be restarted with a permanent x100 boost. Reaching the end of the game will provide yet a further x100 boost. This way the game can be restarted again and again with a rapidly increasing default rate.

There are four towers: the Tower of Metals, the Tower of Mortals, the Tower of Mages and the Tower of Machines. The player is able to hire units to fill in those towers. Every additional unit contributes to the rate.

The fifth tower of the fortress is the Alchemist. It provides upgrades based on various milestones, typically the number of units hired. It also holds items that the player can receive via various means.