No deposit bonus codes explained
A bonus code is just a short label that tells the casino's system which promotion to apply to your new account. It doesn't unlock anything by itself — verification does that — but entering it correctly is what determines whether the right offer gets attached in the first place.
What a bonus code actually does
Behind the scenes, a bonus code is a lookup key into the operator's promotions system. When you enter FS100 at registration, the system flags your new account as eligible for the 100 free spins offer — it doesn't credit anything immediately. The spins only land once you've completed the actual eligibility step, almost always email verification. Think of the code as an address label, not a key: it tells the system where to send the bonus, but verification is what actually sends it.
Where to enter it
- During registration. Most casinos have a dedicated "bonus code" or "promo code" field on the sign-up form itself — enter it here if it's present.
- In the bonus/promotions tab afterwards. If there's no field at sign-up, look for an "Activate bonus" or "Redeem code" option once you're logged in and verified.
- Via a tracked link. Some offers apply automatically if you sign up through a specific link (including links on this site) — no manual code entry needed.
Why the same code can behave differently by casino
FS100 currently unlocks an identical 100 free spins on Big Atlantis Frenzy at both Bitkingz and Crocoslots — but that's a coincidence of these two specific operators, not a rule about codes in general. Each casino's promotions system maps a code to whatever offer it wants independently; the same string of letters and numbers could mean a completely different bonus, or nothing at all, at a third casino. Never assume a code you've seen elsewhere will work the same way on a site you haven't checked directly.
If a code doesn't work
Common causes
- The offer has expired or been replaced with a new code
- Your account or location is geo-restricted from the promotion
- You've already claimed a no deposit offer at that casino before
- A typo — extra spaces or an autocorrected character
What to do
- Check the casino's current promotions page for an updated code
- Contact live support with your registration email and the exact code you tried
- Re-check our comparison page for the current verified code
Frequently asked questions
Do I need a code if I sign up through a review link?
Sometimes tracked links apply the offer automatically, but it's safest to check the bonus tab after registering and enter the code manually if it isn't already showing as active.
Can bonus codes be reused?
No — each code is generally limited to one use per person, household or payment method, enforced through KYC checks.
Is FS100 still active right now?
See our FS100 bonus code guide or comparison page for the current status.