If you are primarily interested in the "solid story," you'll need the , which is a separate paid experience from the free multiplayer.
The campaign download is approximately 32 GB on PC.
You can choose between the Xbox App or Steam, but they use different file structures. Halo Infinite on Steam
If you don't want to buy it outright, the full campaign is included with Xbox Game Pass for PC and console. This is often the most cost-effective way to play through the story officially. Installation Details (PC)
Set on the mysterious Zeta Halo, you step back into the boots of the Master Chief. After a devastating defeat by a mercenary group called the Banished , the Chief must rally scattered UNSC forces and uncover the secrets of the ringworld to stop the Banished from unleashing a new threat.
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