"Mate any piece (v1)": "Mate any piece (v1)",
"Mate any piece (v2)": "Mate any piece (v2)",
"Mate the knight": "Mate the knight",
+ "Meet the Mammoth": "Meet the Mammoth",
"Middle battle": "Middle battle",
"Mongolian Horde": "Mongolian Horde",
"Move like a knight (v1)": "Move like a knight (v1)",