Source: EU Portal
[Updated 26/03] New missions have been added to the Sandbox server. Play a battle and place among the top 12 on your team by base XP earned to acquire 2 more reward tokens. The missions are only for Tier VIII medium and heavy vehicles and can be completed 10 times per account. The mission is available from March 26 at 16:00 CET (UTC+1) until the test end.