Daily bonuses
A free reward collected in the shop on each day of login to a world; the 14th collection gives a mega bonus.
Each day you log in to a world, you can collect a free daily bonus in the shop. After 13 daily collections, the 14th day gives a mega bonus.
Possible daily bonuses
Power bonus voucher, 10 or 25 gold, 1 day of Plus Account, cheaper building upgrade voucher, investment, engine or track vouchers, lottery ticket.
Possible mega bonuses
Free freight or passenger bonus engine, 100 to 1,000 gold, up to 100 lottery tickets, vouchers (halved waiting time, instant dispatch, boost, mechanic), 7 days of Plus Account, bonus engine upgrade voucher.