Checkered Flag is a Booster Pack in Yu-Gi-Oh! GX Tag Force 2. This pack, which can only be unlocked when 95% of all cards have been obtained, contains all cards that can be obtained through packs.
In Yu-Gi-Oh! GX Tag Force 3, there are two Checkered Flag packs - Checkered Flag 1 and Checkered Flag 2. Checkered Flag 1 is unlocked after obtaining 75% of all cards, and Checkered Flag 2 is unlocked after obtaining 90% of all cards. Both of these packs contain all cards that can be obtained through packs, although Checkered Flag 1 does not contain any card from the boosters Don't Stop!, Champion's Pack, Crush on You or any card exclusive to Checkered Flag 2 (formerly of the Champion's Pack in Tag Force 2).