I just want to play sonic robo blast 2

If you have the time and crayons to explain this to me step by step, please do. I have a chromebook that i want to play it on. Please help.

Do this: Chrome OS Flathub Setup | Flathub

Then go to Sonic Robo Blast 2 | Flathub and click install or use the down arrow on the install button to copy and paste the commands into your terminal.