Marathonbet Bonus Code WELCOME100 unlocks a 500% deposit bonus and 300 free spins across five staged deposits for new casino accounts. The code itself is only one field in a longer sequence, and most failed claims happen because something else in that sequence went wrong — the wrong offer was selected, the deposit missed the minimum, or the code was typed after registration had already closed. This walkthrough covers the order of operations, what a successful claim looks like on screen, and the practical steps to take when the bonus does not appear.
Before you open the registration form
Two decisions are worth making before you touch a single field, because both are difficult or impossible to reverse afterwards.
The first is which welcome offer you want. Marathonbet runs a casino welcome package and a separate sports welcome offer, and you generally cannot hold both. If the casino package is what you are after — the 500% staged match and the 300 spins — you need to select the casino offer explicitly during signup rather than assuming the code will route you there.
The second is your deposit size, and it should be settled before you see any promotional artwork. The bonus credit carries a reported 35x wagering requirement cleared on slots, so the sum you deposit dictates the turnover you take on. A €20 first deposit produces a €20 bonus and roughly €700 in qualifying wagers. A €200 deposit produces a €200 bonus and around €7,000. A €1,000 first deposit produces a €1,000 bonus and around €35,000. Deciding the number in advance stops the headline figure from doing the deciding for you.
Where the code actually goes
The code belongs in the bonus or promo code field on the registration form, entered while you are creating the account — not in the cashier, not in an account settings page afterwards. Promotional code fields on signup forms are usually optional and sometimes collapsed behind a small link labelled something like "I have a promo code", so it is worth scanning the whole form before submitting it.
Type the code exactly as written: WELCOME100. Copy and paste is safer than typing, but paste into a plain field can carry a trailing space from wherever you copied it, and some forms treat that space as part of the code. If you paste, click into the field and check the cursor sits immediately after the final character.
The redemption sequence in order
Open the official Marathonbet site and start the registration process from the signup link rather than from a cached page you had open earlier.
Complete your personal details as they appear on the identity document you intend to verify with. Mismatches here surface later as verification problems, not registration errors.
Set your account currency deliberately. It usually cannot be changed after the account exists, and every bonus figure and minimum thereafter is denominated in it.
Enter WELCOME100 in the bonus or promo code field.
Select the casino welcome offer, not the sports offer, wherever the form or the following screen asks you to choose.
Submit the registration and confirm your email or phone if prompted, so the account is fully active before any money moves.
Make a deposit that meets at least the stated minimum — reported at around €5 — to trigger the first tier and its 100 free spins.
Open the promotions or bonus area and read the live terms and the wagering tracker before placing your first wager.
What a successful claim looks like
Confirmation of a staged package usually shows up in more than one place, and checking all of them is the fastest way to know whether the claim landed.
The registration form accepts the code without an inline error and, on many sites, shows the offer name back to you before you submit.
After the qualifying deposit, your balance separates into cash and bonus credit rather than showing one combined figure.
An active bonus appears in the promotions or bonuses section of your account with a wagering tracker attached, showing how much turnover remains.
The first batch of free spins appears against the specific slot titles the operator has chosen, since spins are tied to particular games rather than to a game of your choosing.
A countdown or expiry date is visible somewhere on the active bonus. The reported window is around 14 days from crediting, and it runs from crediting rather than from when you start playing.
If the wagering tracker is present but reads zero progress, that is normal before you have wagered. What matters is that the tracker exists at all — its absence is the clearest sign the bonus was never attached to the account.
When the code does not apply
Work through the likely causes in order of how common they are, rather than assuming the offer is unavailable to you.
The code was rejected on the form
Check for stray spaces, autocorrect changing capitalisation, or an autofill entry overwriting the field. Reload the registration page and enter the code manually. If a browser extension is blocking scripts on the page, the field may not validate at all — try a clean browser session before concluding the code is the problem.
The code was accepted but no bonus appeared
The usual reason is the deposit. If the amount fell below the stated minimum, no tier is triggered and no spins are credited. Check the deposit actually settled rather than sitting pending, and check that the payment method you used is eligible under the live terms.
You were given the wrong offer
Because casino and sports welcome offers are separate and mutually exclusive, an account opted into the sports offer will not show a casino bonus no matter how you deposit. If the wrong offer is showing, contact support before wagering anything — once a bonus has been used, it is far harder to unpick.
Eligibility rules out the claim
Welcome packages are one per household. If an address, device or payment method has already been used to claim, the offer will not apply again, and duplicate accounts are routinely detected. Regional availability and the exact terms of staged packages also vary by market, which is why the live terms at opt-in are the ones that count.
How the later tiers are claimed
The code is entered once, but the package is not. The first deposit is matched at 100% up to €1,000 with 100 free spins. Each of the second through fifth deposits is matched at 100% up to €1,000 with 50 free spins each, adding up to as much as €5,000 in bonus credit and 300 spins in total. Reaching that ceiling means depositing €5,000 of your own money across five transactions, and completing all five tiers at the ceiling implies around €175,000 in cumulative turnover.
Each tier credits when its deposit lands, so each tier brings its own expiry and its own tracker to watch. Spins arriving across five deposits over several days are the easiest element to lose, particularly since free-spin winnings carry a separate 30x requirement rather than folding into the deposit-bonus obligation.
Protecting the claim once it is active
A bonus that credited correctly can still be lost to a rule breach. The restrictions worth holding in mind are consistent across staged packages.
There is a maximum bet while a bonus is active, and exceeding a per-spin cap even once can void the bonus and all progress toward it.
Game weighting means slots typically contribute in full while table and live games contribute little or nothing, so clearing on anything else moves slowly if at all.
Certain high-return slots and bonus-buy features are commonly excluded from wagering entirely.
Turnover counts cumulative stakes rather than losses, so a long grind pays the house edge repeatedly along the way.
Complete identity verification early rather than at the point of withdrawal, so a document check does not collide with the end of the wagering window.
A realistic redemption plan
The practical version of this claim is a single modest first deposit, entered with the code on the registration form, verified early and cleared on eligible slots inside the window. At €20 to €100 the arithmetic is genuinely achievable, and the requirement sits on the bonus rather than deposit plus bonus, which is the more favourable of the two structures. Marathonbet has traded since 1997, so the account side of the process is well established.
Decide the deposit, calculate the turnover it creates, then enter the code — in that order. Confirm the current terms on the official site at opt-in, since staged packages are adjusted by market and campaign more often than most promotions.
Gambling involves risk and is intended for adults aged 18 or over (or the legal age in your jurisdiction). Bonuses carry wagering requirements — read them in full before opting in, never stake more than you can afford to lose, and seek support if gambling stops being entertainment.
Promotional terms, eligibility and values are set by the provider and can change at any time. Always confirm the current terms on the official site before signing up or completing a purchase.