It took me 7 days primarily low betting the whole time to reach level 100. (9 to reach level 110.) Whenever I bet higher than 350-450K, usually, my coins just plummeted within minutes. I think anyone who reached level 100 within 1-3 days bet higher and lucked out tremendously.
Slow and steady guide:

1. Join a club. The higher AND more active the better. Absolute highest is Master 1. From what I've seen, Master I, II and III required players to be a minimum level (like 100+) to join and/or a request to join (mine was never accepted). Unlike similar casino games, Stars Slots won't let you do an advanced search. You can search for a specific club if you know any names, however. So you are left with the option to join the first club on the list that currently has the most collective coins made and which allows members of your current level to join. Either that or create a club (don't recommend). So go ahead and join that first one, but change later based on step #3’s information. Also, the higher the club the bigger percentage of extra free coins you get from different sources within the game. So it goes Master I, II, III, World Class I, II, III, Expert I, II, III, and last is Pro I. Since I couldn't join Master clubs I did best in World II and World I.
2. Collect coins. The FB group, free coins from https://www.peoplesgamezgiftexchange.com/stars-slots-free-chips/gifts or similar website, starting with the most recent and going back as far as you can. Within the game: Once daily spin the wheel; Star Bonus every 60 minutes from far bottom left side of home screen; Huuuge Heist (unlock at level 35) every 15 hours (beside Star Bonus) (the 15 hours increase the higher a level you are at for longer wait)... make sure you've gathered bucks (can see next to dollar image under coin image at top left) (amount of bucks needed increase the higher a level you are at) in case you get an empty box and want to keep what you've won so far with boxes. Tip: An empty box for one round, for example the first one, can also be the empty one in the very next round; it's random each round. I was terrible at this game and should've clicked "give up" sooner than keep gambling; Lottery (ticket to play) every 6 hours (some say value goes up at level 70, so to save them. User batmanbnb below states to save bronze tickets until level 70. It’s up to you whether to save tickets or not.); click on Shop (top middle in green) and on the top right you can click and collect free coins every 8 hours; at the bottom of the Shop screen OR to the right of the Shop image on the home screen you click and watch a video to collect coins, until you can no longer watch, every 8 hours. Also collect coins from club members every time they hit a jackpot and 1 million coins just for first time joining any club through Stars League (middle bottom of home screen).
3. When you join a club click on a team member's profile and connect and you'll get an option to connect/friend every member in the club. I did this and connected to as many people during games I played until I reached my limit. I figured people in the clubs I joined, even lower level clubs, may leave and join higher ones like I did. Probably would be a good idea to go to a tier II game (the middle option for higher betting than Beginner called High Limit once you've unlocked it) and connect to players currently playing it since they have high enough coins to play that. You don't have to play yourself if you don't want to: just drop in, connect, and leave. Then, at the bottom right of the home screen click on Social and you'll see every friend you have. What I did was click on those who had the highest coins at the time and see what club they were a part of: If the club was World II or higher I joined it. Question: What if you want to do better than this club you found (either through this method or the Join Club list) either because its level is too low or not active enough players? Click on Stars League (middle bottom of home screen) then click on Seasons (to the right of Members). This shows you where your club is currently placed. If you see higher placed clubs with available space AND you can join AND it's World Class II or higher then join it. Remember your old club’s name if you ever want to go back, just in case. If you attempt to join a club and you can't get in (maybe you're not at high enough a level) you are also kicked out of your current club for attempting to leave (for some reason), leaving you club-less. My favorite clubs were Polacy2019 (currently World Class I), pour tous (World Class I), and A.Y.M.K.N. TEAM (World Class I).
4. Betting: The general rule of thumb I found was to bet when you have a minimum of 10-20 million, which I agree with. But you can wait, collecting as many coins as you can, to start betting when you have more. The tip I read (and stuck with) was to follow the 1% bet rule: bet 1% of your current chips or even lower (like half of that).
5. Games: Everyone has a different favorite game. Some games are passive (can do Hold for Autospin and not babysit the game) while others you need to be engaged with*. Passive games: God of Sky, Steam City, Neptune's Mistress. *Note: User DilutedDante below stated all games are passive; for the games I saw that wanted my input (choose numbered cards for spin the wheel, etc.) I didn't wait long enough to see if the game would perform the action for me. Recommended games from other users here on Reddit: Wheel of Wins, God of Sky (one of my favorites), Speedy 777 Spins, Retro 81 (one of my favorites), Fortunes Jackpots (never played), and Jackpot Mania (never played). Of course, more games are unlocked the higher the level you reach. I recommend that if you are under 30 million to play God of Sky or Speedy 777 (which didn’t work too well for me, but others like it when trying to gain coins). Remember to do minimum betting or 1% or lower betting. Occasionally I would switch games and play Retro 81 or Wheel of Wins. Do this until you reach level 38 and unlocked Steam City and level 40 to unlock Neptune’s Mistress. I almost exclusively played these two, passively, to reach level 100. My method was betting 100K or 125K (if I had a minimum of 40-50 million). I didn’t feel secure enough to bet 250K or higher until I had a minimum of 100 million because otherwise I would run out of coins too quickly. I rarely bet higher than 500K. I think it took 2 hours or so, minimum betting, to level up each time. So that’s why it took me a week to do this and reach level 100. I found Steam City to be the best game overall as another user did. Sometimes, even at lowest betting and even with 100+ million coins and leaving it to play on its own, I would lose all coins. But that’s OK - just collect coins again and play again. It’s all luck. Another time I started with 15 million and it jumped to 125 or so million in a short amount of time with 100K betting playing Neptune’s Mistress.
6. I don’t recommend Daisy’s Challenges (far bottom right of main screen). The games to be played either rarely had wins for me or the minimum bet required to unlock a box was higher than I was comfortable doing. See user DilutedDante's comment below for benefit of doing Daisy's Challenges.

If anyone has any other tips or corrections on what I've said (I've read other users got into Master clubs, but they all seemed to be for very high level players?) please share! This is just my conservative and mostly passive playing guide based on how the experience was for me. Some users do recommend Daisy's Challenges or betting higher playing the 2nd tiemiddle High Limit slot machine and had better luck with those than I did.
I gathered many other tips from various users from the Swagbucks Reddit thread not mentioned here. If anyone wants me to include some of them I can.
See below for user Kpheark1's additional tips.

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I'm literally level 17 and I'm almost out of coins already (1 mil) and I'm min betting only. Bad luck or am I doing something wrong? I claimed the extra coins, and joined a club already.

I’m stuck at level 76 and don’t even have enough coins to spin once at min bet. I have 12 days left and I don’t want to spend money on the game. Plz help

I got to level 96 in about one afternoon but now I am going VERY slow. Any tips on how to get these last 14 levels? People said it goes on pending at 100 but nothing for me goes on pending so I will need 110 for a ticket.

I am currently doing an offer for Huuuge Casinos that states that reaching level 160 or 150 (not sure) will credit me $40. Did anyone get credited?

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I’m about to try the Stars Casino offer and it says I have 14 days to do it. I would like to know how long it actually took someone who did the offer.

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Definitely good money makers, starts pending instantly after completing the levels.

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Anyone completed this game and get credited?? So far I completed pop slot casino, coin star but didn’t get credited. kind of feeling that I am wasting my time playing these games.

Ok so this game just sucks big fat donkey kong sized shlong.
It took me Weeks? I lost track of time, blazed thru copious amounts of weed and found barely any free coins outside of what the game decides to give you.
Speedy 777 Wins is in my opinion the best game to get coins from. I hit more free games on that shit then anything and more wins. Bet MIN till you get into the millions then increase slowly as long as your winning, if your not winning that machine is shit get up and reload a new machine.
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If you can manage to finish the game and get credited and not hang your self out of repetitive stress clicking I congratulate you!

Are there other easy offers like Star Slot Casino?

Credited immediately when I reached level 80! Took me around 3 hours, mostly on auto spin and betting max. ( I was lucky and hit jackpot early on which allowed me to continue playing without waiting for free chips.)
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