The Super Plumber of Undertoad Mario is a massive, safe nation, renowned for its burgeoning yoshi population. The hard-working population of 2.974 billion Undertoad Marioans have some civil rights, but not too many, enjoy the freedom to spend their money however they like, to a point, and take part in free and open elections, although not too often.

The medium-sized government juggles the competing demands of Law & Order, Defense, and Education. The average income tax rate is 23.0%.

The Undertoad Marioan economy, worth 129 trillion coins a year, is fairly diversified and led by the Book Publishing industry, with major contributions from Information Technology, Basket Weaving, and Tourism. Average income is 43,438 coins, and evenly distributed, with the richest citizens earning only 3.6 times as much as the poorest.

Crime is well under control, thanks to a well-funded police force and progressive social policies in education and welfare. Undertoad Mario's national animal is the yoshi.

Undertoad Mario is ranked 170,907^th in the world and 18^th in Dark World for Lowest Crime Rates, with 59.22 law-abiding acts per hour.