Number three is correct with or without in rank. The other two have errors.
What I should be using in place of "in rank"?
Nothing. Either include it in the sentence or leave it out. It's correct either way.
In the Crisis Action game Tim's level is twice as high as Tom's.
Tim has higher rank than Tom.
Could you please tell me what is the correct way of writing these two sentences?
In Crisis Action, Tim is two levels higher than Tom.
As long as your listener is familiar with the game, they'll know what you mean. Anyone who's not familiar with the game won't care.
The first should have a comma after game. The second needs an indefinite article before higher.
In the Crisis Action game, Tim's level is twice as high as Tom's.
Tim has the higher rank than Tom.
Are these correct?
I put a 'comma' after game and 'the' before higher rank.
"The" is not correct. Don't you know what an indefinite article is?
Now I know, I just searched it. Okay "A" and "An" are indefinite nouns.
Now I know, I just searched it. Okay "A" and "An" are indefinite [STRIKE]nouns[/STRIKE].
Tim has a higher rank than Tom. Is it correct now?