Porting Balatro to the Nintendo E-Reader: A Herculean Task

2025-06-21
Porting Balatro to the Nintendo E-Reader: A Herculean Task

The author, a huge fan of the card game Balatro, attempted to port it to the Nintendo Game Boy Advance's E-Reader peripheral. The E-Reader's limitations—small screen resolution, limited memory, and restricted numerical processing capabilities—presented significant challenges. A prototype was created, but it only includes a fraction of the core gameplay with simplifications like a streamlined scoring system and a reduced number of special cards. The author details the various technical hurdles encountered, including decimal number precision, sprite limitations, memory space constraints, and text display issues, exploring potential solutions. Ultimately, the prototype remains unreleased pending the original game's creator's approval.

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Game

Reverse Engineering Nintendo E-Reader's Drawing API: A Stack-Based Secret

2025-02-02
Reverse Engineering Nintendo E-Reader's Drawing API: A Stack-Based Secret

A developer, while creating a Minesweeper game for the Nintendo E-Reader, stumbled upon a hidden feature in the `DrawLine` function of its drawing API. Initially, a loop drawing a minimap rectangle using `DrawLine` revealed lines drawing progressively faster. The developer discovered the draw time was determined by a value pushed onto the stack, a combination of the loop counter and another register. By pushing 0 onto the stack, the issue was resolved, revealing a quirky API detail. This showcases the intrigue of reverse engineering and the peculiarities of older processor architectures.

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