The bulk update request #2600 is active.
mass update portal -> portal_1
remove implication portal -> portal_(series)
create implication portal_1 -> portal_(series)
I sometimes made the mistake of using portal for the object, when in fact this tag is currently for the first video game in the Portal series. In any event, I don't think portal should be for that video game. The object seems more important than the game. As in, everybody knows what a portal is, but not everybody played that game.
I think it would be a good idea using portal_1 as the tag name for the first game, as opposed to portal 2. This would be a bit like final fantasy i, final fantasy ii, etc. The tag portal can be kept as an empty disambiguation tag, since we already have portal (object) for the object.
(Edited title.)
EDIT: The bulk update request #2600 (forum #166219) has been approved by @evazion.
Updated by DanbooruBot