Note that you can claim a premium game without needing to install it on your phone. Here's the guide: http://aveyntoh-blog.blogspot.com/2018/08/claim-free-premium-game-on-gplay-no-install.html
Alright, it's giveaway time... here goes! :)
P/S: Use Ctrl+F to search for the game/dates. Giveaways that are expired will be archived at the end of the post.
All dates listed are approximation (don't wait until the very last minute to claim these free games!) and is based on the time zone, GMT+8.
Update:
18/9 - Added new games, archived old ones
1. Legend of the Skyfish
Claim your free game before: Sept 26Link: http://zipansion.com/428R1
2. Crazy Tap Chef VIP
Claim your free game before: Sept 27Link: http://zipansion.com/428Ye
3. Connect - colorful casual game
Claim your free game before: Sept 28Link: http://zipansion.com/428ea
Archived
1. Mystery of Fortune 2Claim your free game before: Sept 1
Link: http://zipansion.com/3JgEk
2. Classic Sudoku Premium (No Ads)
Claim your free game before: Sept 2
Link: http://zipansion.com/3JgjA
3. Mathology - Brain Game
Claim your free game before: Sept 1
Link: http://zipansion.com/3NH8L
4. Cubes
Claim your free game before: Sept 3
Link: http://zipansion.com/3T3DS
5. Survive: The Lost Lands
Claim your free game before: Sept 7
Link: http://zipansion.com/3T20x
6. ExtremeJobs Knight's Assistant VIP
Claim your free game before: Sept 3
Link: http://zipansion.com/3JgRt
7. Mental Hospital: Eastern Bloc
Claim your free game before: Sept 4
Link: http://zipansion.com/3T24j
8. Mental Hospital: Eastern Bloc 2
Claim your free game before: Sept 4
Link: http://zipansion.com/3T1SW
9. Cartoon Craft
Claim your free game before: Sept 3
Link: http://zipansion.com/3JgnV
10. AngL
Claim your free game before: Sept 10
Link: http://zipansion.com/3Ykw8
11. A Dark Dragon
Claim your free game before: Sept 16
Link: http://zipansion.com/3kaTt
12. Fuzzy Seasons: Animal Forest
Claim your free game before: Sept 14
Link: http://zipansion.com/3kaWN
13. 2 Player Quiz Pro
Claim your free game before: Sept 15
Link: http://zipansion.com/3kaZH
14. Reporter 2
Claim your free game before: Sept 13
Link: http://zipansion.com/3kacM
15. SOMEDAY
Claim your free game before: Sept 13
Link: http://zipansion.com/3kaeR
16. 13 DAYS OF LIFE
Claim your free game before: Sept 13
Link: http://zipansion.com/3kaig
17. CashKnight ( Ruby Event Version )
Claim your free game before: Sept 20
Link: http://zipansion.com/2h626
18. Tank Raid Online Premium - Editor's Choice!
Claim your free game before: Sept 20
Link: http://zipansion.com/3rjQJ
19. Tales of Illyria:Fallen Knight
Claim your free game before: Sept 22
Link: http://zipansion.com/3rjie
20. Calc Fast
Claim your free game before: Sept 23
Link: http://zipansion.com/2mQs7
21. Dungeon X Pixel Hero VIP
Claim your free game before: Sept 22
Link: http://zipansion.com/3rjvs
22. Ekstar 2048
Claim your free game before: Sept 22
Link: http://zipansion.com/2h63T
23. Legend of the Skyfish
Claim your free game before: Sept 26
Link: http://zipansion.com/428R1
24. Crazy Tap Chef VIP
Claim your free game before: Sept 27
Link: http://zipansion.com/428Ye
25. Connect - colorful casual game
Claim your free game before: Sept 28
Link: http://zipansion.com/428ea