YOU SAID:
Mario jumps on a Koopa Troopa.
INTO JAPANESE
マリオは、クッパ Troopa にジャンプします。
BACK INTO ENGLISH
Mario goes to Koopa Troopa.
INTO JAPANESE
マリオは、クッパ Troopa に行きます。
BACK INTO ENGLISH
Mario goes to Koopa Troopa.
That didn't even make that much sense in English.