Independent game developer Lislore Goedhard proposed to Ted Martens by modifying Crypt of the Necrodancer with the aide of the game's designer Ryan Clark and composer Danny Baranowsky.

Martens is a pixel artist  on Crypt of the Necrodancer himself, which allowed Goedhard to recruit his colleagues on the game to help her propose. The three of them created a wedding remix of level 1-1 of the game with a sprite of Goedhard acting as the protagonist. A surprised Martens played through the level finding a door key, coffee, zombies, and a ring, according to Goedhart's twitter.

The level culminated in the proposal. He said yes.

Developers have used games for proposals and messages of love before. One of the more famous and stranger examples is a hidden debug message in Bart Simpson's Escape from Camp Deadly on the Gameboy. The Crypt of the Necrodancer proposal used new assets just for popping the question, which definitely makes it unique.

Crypt of the Necrodancer is available on PC, Mobile, PlayStation 4, Vita, Xbox One, and soon the Switch.