The online biography of artist Ward Moore noticed by the noticers at superannuation reveals two SimCity spin-offs Maxis cancelled before release, saying: "I would also be fortunate enough to create art for SimCASTLE and SimMARS first playable projects. (These would both be cancelled in favor of the blockbuster SIMS.)" Also, the portfolio for illustrator Corey Keller (likewise spotted by superannuation) has some concept art from one of the projects, as Corey says: "These drawings and texture tile examples were done for the unreleased Maxis Kids title "SimCastle". This was a cheery medieval simulator based on the popular SimTown engine."