загадка

Noun

 * 1) riddle, conundrum, puzzle
 * 2) mystery, enigma

Noun

 * 1) riddle, conundrum, puzzle
 * 2) mystery, enigma

Noun

 * 1) riddle, conundrum, puzzle
 * 2) mystery, enigma

Noun

 * 1) riddle, conundrum, puzzle
 * 2) mystery, enigma
 * 3)  command, order

Usage notes
За́гадка (with stress on the first syllable) is still considered to be the only literary norm by some, if not most, linguists. However, зага́дка is also very common, although some may consider it to be influenced by Russian or Polish.