YOU SAID:

I can do worser than that.

INTO JAPANESE

それよりも worser いいんです。

BACK INTO ENGLISH

It is better than it worser.

INTO JAPANESE

それはそれは worser よりです。

BACK INTO ENGLISH

It's worser than it is.

INTO JAPANESE

それよりも worser です。

BACK INTO ENGLISH

This is worser than that.

INTO JAPANESE

これはそれよりも worser です。

BACK INTO ENGLISH

This is worser than that.