でろでろデッド is a free casual rhythm game available on iPhone, developed by Happy Elements K.K. Players engage in simple tap mechanics to defeat incoming enemies, with gameplay designed to be quick and accessible. The game features four distinct enemy types that players must identify and tap to eliminate, with a limited number of three lives, leading to a game over if all lives are lost.

The game offers two modes: Normal Mode, where enemy speed remains constant but gradually increases the appearance of challenging enemies, and Hard Mode, which sees a progressive increase in enemy speed and difficulty. Players can also track their scores, encouraging competition against their personal bests. This game is part of a unique project where a small team develops a game within a month, showcasing creativity and passion in game design.