Game tokens offered through IGOs mostly have a lock-up condition for a certain period of time, allowing holders to claim tokens according to the lock-up schedule even after an allocation. Please understand that such lock-up scheme is devised to support the soundness of a game community.
Participating in an IGO through the Iskra Launchpad allows you to receive the same number of Express Tokens (without a lock-up condition) as your allocation. Express tokens serve as the right to claim for the game tokens allocated through the IGO and a ticket immediately usable in the game. You can immediately use them on game contents or wait for a vesting period to claim your game tokens.