Thank you. Given the consent requirement, and the way immediately retracting consent doesn't always seem to stick, I've avoided claiming giveaways lately - but this does look like an entertaining diversion.

Tomb Raider: Legend

BUCP30A8C1399B4571

Blade of Darkness

83U9_D48A894EB4BA4 --- edit: redeemed

Oh no! ONE digit is missing! Dang.
( See? I can create puzzle giveaways, too! :-P )

Thanks for the key,much appreciated.

Tomb Raider: Anniversary

PDRBF655274F93_6F8 --- edit: redeemed

I apologize for the missing digit in the last giveaway and promise improvement.
There's ZERO chance of this ever happening again.

Thanks for game with Lara ❤

Thanks Palestine for the write-up. I missed this nice puzzle, but I don't think I'd gotten it anyway. Especially since, for example, if I look up roentgenium I find its atomic mass to be 282, as it's by far its most stable known isotope it seems. I wondered why NIST rather picked 280 and also saw that that Royal Society of Chemistry lists 280 as its "key isotope", but I guess it's just because both 281 and 282 were the last ones to be discovered (in 2010) and those data are simply not up-to-date (in case anyone cared!). Anyway,that would likely have thrown me off.
Well done to those who cracked it though!