🏙️Sphere upgrading

Each new player has level 1 on each sphere. Level number - quantity of tools of the same sphere that can mine resources at the same time.

For example, if you upgrade the OIL sphere to level 2, it means that 2 oil tools can work in parallel.

Prices for upgrading are the same for each sphere. OIL sphere upgrade price means the number of oil tokens etc.

Sphere level	Price
2	50
3	80
4	140
5	215
6	300
7	400
8	515
9	590
10	780

An upgraded sphere also increases the player's profit from mining. Sphere multiplicator just like season index impacts final profit by multiplying season-based reward.

Premium/Silver pass also multiplies it by 1.5/2.

For example, if you have a 10 sphere level and staked premium pass, the total sphere multiplier will be equal to 1.36, since 1 + 0.18 * 2 = 1.36, with a silver pass it would be equal to 1.27

Sphere level	Multiplicator
1	1
2	1.02
3	1.04
4	1.06
5	1.08
6	1.1
7	1.12
8	1.14
9	1.16
10	1.18