How do I get these random bonuses and what are they

Question

Sometimes an icon pops up in the game and starts moving around. You can click it for a temporary bonus, but how are these initiated (is it just random?) and what are they.

So far I've found a wealth bonus (doubles gold from sales) and a speed bonus (makes each tick take half a second).

Answer 1

The upgrades are random events that occur during gameplay, they are not triggered, rather they spawn every 10-20 minutes.

The three available are as stated

• Wealth (Double gold)
• Speed (Half tick time)
• Power (Double Damage)