I've found two games with system link mode that currently aren't supported by link according to the website.
One of them is Legendary
the other is Stormrise
I can confirm the LAN features on the NTSC and PAL versions of the games respectively, but I doubt it will vary by region. Legendary did not print system link on the boxart, whereas Stormrise did.
Two System Link Games Not Supported By LiNK
in Unity Support
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I've found two games with system link mode that currently aren't supported by link according to the website.
One of them is Legendary
the other is Stormrise
I can confirm the LAN features on the NTSC and PAL versions of the games respectively, but I doubt it will vary by region. Legendary did not print system link on the boxart, whereas Stormrise did.