What do you mean non canon?
It’s been quite a while since Leon Belmont had to fight a vampire, but now in 1450, the fallout of those events have come to a head: Count Dracula has returned to drown Transylvania in darkness. But the Belmont family still lives, and now all these years later Sonia Belmont has arrived to save the land from the Prince of Darkness.
Welcome to Castlevania Legends, the first Game Boy Castlevania game! It… really shows. It’s a bit barebones compared to what you might be used to from some of the console games, but it’s not terrible. It’s just got some strange design decisions, stiff gameplay and a strange difficulty curve. That being said, the music is amazing, having both good original pieces and remixes, so it’s not as rocky as it could be as the first handheld Castlevania. It’s also important to note that, at the time, this was supposed to be the first canonical game in the series, with Sonia being billed as the first Belmont to fight Dracula. But Lament of Innocence came out, and also Iga said the game was non-canon, so technically this is a separate timeline entirely. But that won’t stop me from willing Sonia into canon myself!