Did you check 2018? It has 50% off on micro upgrades and 70% off on speed ups.

I loved the Birthday every single year i have played, and it seems fun this year too. ? Though, i have a concern ;All these years you have been giving us 50% off on Upgrades and 70% off on speed-ps, why would you change it? Now it just makes it harder to upgrade your tank. The sale is the main attraction of the Tanki Birthday. Tankers save up their crystals for this day and now it gets a lot more expensive to upgrade your tank and make your way to the dream tank. I hope you change it to 70% off on speed-ups, as it has always been.

This is not a repeat entry, the earlier entry with a similar name is not mine.