We don't have synonyms for kaizo yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are kaito, kaido and kaino.
(n) :
(video games, often attributive) A philosophy of game design distinguished by very high difficulty levels and hidden traps that can only be solved by repeated deaths and trial and error, especially associated with romhacks of Super Mario games.
(n) :
(video games, often attributive) A philosophy of game design distinguished by very high difficulty levels and hidden traps that can only be solved by repeated deaths and trial and error, especially associated with romhacks of Super Mario games.