You can take a quiz to get 5 games in a tier 8 premium rental tank:
At the end you get a code to redeem based on your choices. You can take it unlimited times, but only redeem one code.
REDEEM LINK: (edit with your tank of choice)
To save you some time, all the codes are in this format: IAM _ 2020 where _ is the name of the tank.
Ex: IAM50TP2020.
These tank (codes) are available:
M4190
50TP
T26E5
LOWE
LT432
PROGETTO
SKORPION
STRVS
ELCEVEN
T92LT
M449 (AMX m4 49)
SOMUA
MAUERBRECHER
TURTLE
KJP105 (kanonen jpz)
TS5
Source: https://www.reddit.com/r/WorldofTanks/comments/g9fc7s/attention_frontline_quiz_tank_codes/
