(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
Sonic Generations is on sale for $7.49 (75% off) today only as the GMG Daily deal for 12/31. Use the voucher code GMG30-DPLIM-DN831 for an extra 30% off, which makes the game only $5.25. The game requires Steam activation.
Cities in Motion Collection is on sale for $12.49 (75% off). Use the same code listed above and it drops to $8.75. The game also requires Steam activation.