I lost The Game?
Would it be, "Yo perdido el juego?"
HI Byak, welcome to the forum
You almost got it:
Perdí el juego
I am huge soccer fan and they also refer to a "game" as partido all the time
Un partido de fútbol, por ejemplo.
It could be he perdido el juego but not yo perdido and as Heidita as said it could be perdí el juego because perdí is 1st person preterite meaning I lost and if you lost something it is in the past even if you only lost it a few minutes ago so perdí is the best answer.
No, perdido is the past participle of the verb Perder. You need to conjugate Perder using the past tense (indicative mood). I don't know if you have studied the difference between preterite and imperfect past, so I'll just give you the link to Perder conjugated.
Look for Hieditás choice and see if you can figure out why it is correct.