Anyone who has sat in Rain.gg's chat for half an hour has seen the free Treat rain land and watched people scramble for a share. The signup code works differently. When you register with the code BONUS, you get 3 free cases and a 5% bonus on your deposit. For a player in the United States, that means a small top-up on whatever dollar amount you put in, plus three cases to open. The cases appear to unlock after a successful deposit, not at registration. Below are the actual numbers, the steps, and the points worth checking before you spend anything.
BONUS - 3 free cases and a 5% deposit bonus
Rain.gg is a CS2 case unboxing site that calls itself the fastest growing one in its niche. BONUS works as a referral or affiliate code. You type it into the referral field when you create your account. It is not one of the one-claim codes the site posts on X for races and limited promos. Those are separate, so don't try to use one in place of the other.
Rain.gg describes the reward for signing up with an affiliate code as an extra deposit bonus plus 3 additional cases after a successful deposit. In plain terms, the three cases are not a no-strings freebie. You most likely need to fund your account before they show up. The 5% is added on top of what you deposit.
There is one open question. It is not fully clear whether the 5% applies only to your first deposit or to every deposit after that. Some players describe it as ongoing. Treat that as possible but unconfirmed. The deposit screen shows the terms that actually apply to your account. The offer can also change over time, so read that screen before you confirm a payment.
Outside the code, Rain.gg has its own free stuff:
None of these depend on BONUS. They are worth knowing about, though, because they often add up to more over a month than a 5% top-up does.
Beginners mostly want to know one thing: does typing five letters make a real difference? The table below compares the same deposit made with and without the code. It assumes the 5% is credited at the same value as your deposit. If the site converts your dollars into its own balance, the ratio stays the same but the displayed numbers may look different.
| Deposit | Without code | With BONUS |
|---|---|---|
| $10 | $10 balance | $10.50 balance + 3 free cases |
| $25 | $25 balance | $26.25 balance + 3 free cases |
| $100 | $100 balance | $105 balance + 3 free cases |
Say you put in $25 because you want to try a few cases without risking much. The 5% adds $1.25, so your balance reads about $26.25. That extra $1.25 is enough for maybe one cheap case, or a slightly longer session. The three free cases are the bigger part of the deal at this size. Their value isn't published, so don't plan around them. Count them as a free shot at a skin, not as money in your pocket.
At $100, the 5% becomes $5, and your balance lands around $105. That is more noticeable, but it doesn't change the math of case opening. Every case still has the same odds, and most openings return less than they cost. The bonus stretches your budget a little. It doesn't tilt the game in your favor.
It costs you nothing, so if you are going to sign up and deposit anyway, enter it. The one situation where it doesn't help is when you only planned to collect free daily cases and Treat rains without ever depositing. In that case the cases tied to the code probably stay locked, and the 5% has nothing to apply to. Never deposit just to "activate" a bonus you weren't planning to use.
The process is short, but the order matters. The code goes in at registration, not afterward.
If something doesn't show up after the deposit, contact the site's support with your account details. Don't open a second account to try again.
Most of the deal is the same wherever you live. The surroundings are what change for American players.
Your Steam wallet runs in US dollars, so you'll naturally think in USD when you value skins and deposits. That makes the 5% easy to work out: just take a twentieth of the amount. People in the United States usually pay online with Visa, Mastercard or American Express cards, PayPal, Apple Pay, Google Pay, Venmo, Cash App or ACH bank transfers. That is general shopping habit, though. It tells you nothing about what Rain.gg actually accepts. The deposit screen lists the real options, so check there and don't assume your favorite method is supported. It is also worth glancing at a roundup of case sites before committing any money.
Time zones matter a little if you chase the daily cases. A player in New York City runs on Eastern time (UTC-5, or UTC-4 in summer). Someone in Los Angeles is three hours behind on Pacific time. Chicago and Houston sit on Central time. Most of Arizona skips daylight saving, and Hawaii does too. Whatever the site's reset point is, it will hit a different local hour depending on where you are. Note it once and you won't miss a claim.
Gambling in the United States is regulated mainly by states, through state gaming commissions and lottery agencies. Federal laws such as the Wire Act of 1961 and the UIGEA of 2006 sit on top of that. Since the Supreme Court's 2018 ruling in Murphy v. NCAA, each state decides on sports betting, and only a minority allow online casino games. The minimum age depends on your state and the product. It is typically 21 for casinos and most sports betting, and 18 for some lotteries.
Case opening also gets real scrutiny here. In February 2026, New York's Attorney General sued Valve in state court, alleging that loot boxes in Counter-Strike 2 and other Valve games amount to illegal gambling under the state constitution. Back in 2017, the FTC settled with the two YouTubers who owned CSGO Lotto, because they had promoted the site without disclosing that they owned it. Nothing here says whether Rain.gg is allowed where you live. Check your state's rules, and confirm that Rain.gg accepts accounts from the United States before you deposit a single dollar.
American CS fans have plenty to be proud of. Cloud9 won the ELEAGUE Major in Boston in January 2018, beating FaZe Clan at Agganis Arena. It was the first Major win for a North American team. In June 2025, Austin hosted the BLAST.tv Major, where Vitality beat The MongolZ 2-1 at the Moody Center. Players like EliGE helped make CS a big deal here. Unboxing is a side activity to the game itself, and it's fine to keep it that way.
Most problems with signup codes come from a few predictable slips. These are the ones beginners make most often:
Some habits make the whole thing calmer. Grab the free Treat rains and daily cases before you spend real money. Set a monthly limit in dollars and stop when you reach it, win or lose. Treat the free cases as entertainment, not as a way to make money.
This is for adults only: 18 at the very least, and 21 if that is the age that applies to similar products in your state. Budget first, bonus second. If case opening or any gambling starts to feel like something you can't put down, the National Problem Gambling Helpline from the NCPG is free and open 24/7. Call or text 1-800-MY-RESET (1-800-697-3738). The older 1-800-522-4700 number still works too, and Gamblers Anonymous runs peer support groups.
Here are short answers to the questions new players ask most often.
The code itself isn't tied to a country, but you first need to confirm that Rain.gg accepts accounts from the United States. Also check your state's rules on gambling-style products, since regulation and age limits vary by state.
You enter BONUS once, at registration, in the referral field, so it is tied to that one account. Whether the 5% keeps applying to later deposits isn't fully confirmed, so check the deposit screen.
Yes, very likely. The 5% is calculated on a deposit, and the 3 free cases appear to arrive after a successful deposit, not at signup.
On $25, the 5% is only about $1.25, so the 3 free cases are the main appeal. It costs nothing to enter, but don't deposit just to claim it.
Confirm that Rain.gg accepts United States accounts, that you meet your state's age limit, and which payment methods the deposit screen actually offers. Then read the bonus terms on that same screen and stick to your planned dollar amount.