Custom tags allow you to create your own tags and tag problems with those new tags. There are several uses for custom tags, one is to act as a bookmarking system where you can create a 'favourites' tag, and tag problems with that tag. Another is to create a 'review' tag and tag problems you feel you need to review at a later stage, when you've reviewed the problem, you can remove the tag.

Custom tags can be used to search problems with those tags in the advanced problem search where they are shown in the tactical motifs/tags list. Custom tags are most powerful when combined with custom problem sets. For example , using the 'review' example above, you could tag problems with the 'review' tag, and create a custom 'review' problem set which matches problems with this tag. This could be combined with the 'Problems I always got wrong' criteria to produce a review custom set that keeps giving you the review problems until you've successfully got them correct.

To create a new custom tag, click the Create Tag button next to the tag voting buttons, enter the tag name, and click Create to confirm the new tag. After creating the new tag, you can start adding it to problems in the same way you add existing tactical motif tags.