u/AdamGuater

I'm quite confused about it. From what I understand after Okabe starts laughing when Suzu and Mayushi succesfully go to the past his plan is to save them right?

So him Daru and the loli girl,kagari start working on a time machine that is completed in 2025,they record Daru and Okabe's dmail to reach Steins Gate and then Okabe goes to 18000 bc and saves Mayushi and Suzu.

But now I start becoming quite confused,does all this get "rewritten" and we get the happy ending of original steins gate ep 24-25? Or am I very lost