Roman Numerals That Multiply to 35: Rule 9 Guide

Rule 9 of The Password Game looks deceptively simple—until you realize that Roman numerals I, V, X, L, C, D, M must multiply to exactly 35. The correct answers are XXXV or V and VII, and you can also tackle related rules like the atomic number rule.

Game released: 2023 · Number of rules: 35+ · Rule number for Roman numeral multiplication: 9 · Only factors of 35: 1, 5, 7, 35 · Most common solution: XXXV

Six key facts about Rule 9, one pattern: the solution always comes down to the factors of 35.

Password Game Rule 9: What Roman Numerals Multiply to 35?

Understanding the rule

• Rule 9 states: “The Roman numerals in your password must multiply to 35.” (The Password Game Wiki – Fandom)
• The only factors of 35 are 1, 5, 7, and 35. (Wikipedia)
• In Roman numerals, I=1, V=5, VII=7, X=10, L=50, C=100, D=500, M=1000. (Wikipedia)
• The rule requires the product of all Roman numerals in the password to be 35 — not just a single pair. (Tech.co)

The implication: you need to ensure that every Roman numeral you include, when multiplied together, gives exactly 35. If you add extra Roman numerals, their product will change.

Simple solutions: XXXV

• XXXV = 35 (30 + 5). This is the standard, non-subtractive notation. (Tech.co)
• If you already have a Roman numeral from Rule 7 (e.g., V), you can add XXXV and the product becomes V × XXXV = 5 × 35 = 175 — which fails. So you must remove the extra numeral or adjust. (Reddit)
• Many speedrunners use XXXV as their single Roman numeral answer for both Rule 7 and Rule 9. (YouTube speedrun walkthrough)

Alternative: V and VII

• V × VII = 5 × 7 = 35. (Tech.co)
• Tech.co notes there are exactly two ways to satisfy Rule 9: XXXV × I or V × VII. (Tech.co)
• If you use V and VII, you must separate them with non-Roman characters (e.g., “V7VII” or “V-VII”), otherwise they combine into a single numeral. (The Password Game Wiki – Fandom)

The catch: if you already have a single I from Rule 7, adding VII will give I × VII = 7 — not 35. Plan your Roman numerals carefully.

What’s the Roman numeral for 35?

The correct numeral: XXXV

• 35 in standard Roman numerals is XXXV. (Wikipedia)
• Breakdown: 30 = XXX, 5 = V, so XXXV. (Wikipedia)
• No subtractive notation is needed for 35 (unlike 40 = XL or 9 = IX). (Wikipedia)

Common mistakes with XXXV

• Some players try VL (45) or other non-standard forms. Those are incorrect because 35 has no subtractive shortcut. (Wikipedia)
• Using lowercase “xxxv” may work in some browsers, but Tech.co recommends capital letters for reliability. (Tech.co)
• Don’t add extra Roman numerals like I to the password unless you remove them later — they change the product.

What is rule 7 in the password game?

Rule 7: Your password must include a Roman numeral

• Rule 7 appears before Rule 9 and requires at least one Roman numeral in the password. (The Password Game Wiki – Fandom)
• Any Roman numeral works: I, V, X, L, C, D, M. (Wikipedia)
• Many players choose V or I because they are small and easy to combine later. (Reddit)

How it interacts with Rule 9

• If you pick V for Rule 7, you can later add VII to satisfy Rule 9 (V × VII = 35). (Tech.co)
• If you pick I for Rule 7, you need to add XXXV to get 35 (I × XXXV = 35). But having I and XXXV together without a separator is fine — the game treats them as separate numerals. (The Password Game Wiki – Fandom)
• The trade-off: choosing a small numeral like I keeps your password short but forces you to add XXXV later, which adds 3 characters.

How to put the fire out in the password game?

The fire rule (Rule 10)

• Rule 10 appears immediately after Rule 9 and adds a fire emoji 🔥 to your password. (The Password Game Wiki – Fandom)
• The fire disappears when the atomic numbers of the element symbols in your password sum to 200. (The Password Game Wiki – Fandom)
• Element symbols are case-sensitive: S (sulfur, 16), C (carbon, 6), O (oxygen, 8), etc. (Wikipedia)

Solutions: using element symbols with atomic numbers summing to 200

• Common combinations include S (16), C (6), O (8), and U (92) to reach 200. For example, S + C + O + U = 16+6+8+92 = 122 — still need more. (Reddit)
• A known solution: “S” (16) + “C” (6) + “O” (8) + “U” (92) + “Ni” (28) + “Fe” (26) + “Al” (13) + “Mg” (12) = 201 — close but one over. Players often tweak by swapping elements.
• Tech.co suggests using a periodic table calculator to find a combination that sums to exactly 200. (Tech.co)
• Note: Roman numerals like V (Vanadium, 23) or I (Iodine, 53) also count as element symbols! So if you use V for Rule 7, it adds 23 to the atomic sum. (Wikipedia)

How to make a password strong in a password game?

General tips for Password Game

• The Password Game has over 35 rules, each adding a constraint. (Tech.co)
• Start with a base that satisfies the early rules (7, 9, 10) before adding later requirements like capitals, digits, and special characters.
• Use a systematic approach: keep a notepad of your current characters and their rule contributions. (Speedrun.com)
• External tools like Roman numeral converters and periodic table calculators can save time. (Tech.co)
• Patience is key — the game is designed to be frustratingly fun. (Neal.fun)
• For more on password security, check out our article on the 16 Billion Passwords Breach.
• If you enjoy puzzle games like The Password Game, you might also like Geometry Dash Hooda Math.

Managing multiple constraints

• Rule 9 interacts with Rule 7, Rule 10, and later rules that require specific characters. Plan your Roman numerals to avoid conflicts.
• For example, if you use XXXV for Rule 9, you cannot use X later as a Roman numeral because it would multiply the product. You can use digits or letters that are not Roman.
• Speedrunners often use a single Roman numeral (XXXV) and then build the rest of the password around it. (YouTube speedrun walkthrough)

Using tools like calculators

• Online Roman numeral calculators can verify your product. (Wikipedia)
• Periodic table calculators help find atomic number combinations that sum to 200. (Tech.co)
• Community forums like Reddit share tested solutions for later rules. (Reddit)

Step-by-Step Guide to Solving Rule 9

1. Check your current Roman numerals. If you already have a Roman numeral from Rule 7, note its value (I, V, X, L, C, D, M).
2. Choose the simplest path. If you have no Roman numeral yet, add XXXV — it satisfies both Rule 7 and Rule 9 in one go. (Tech.co)
3. If you already have a numeral, calculate the product. For example, if you have V, you need to multiply by 7 to get 35 — add VII. If you have I, add XXXV. (The Password Game Wiki – Fandom)
4. Ensure separators. If using two numerals, place a non-Roman character between them (digit, letter not Roman, or symbol). Example: “V7VII” works because the 7 is a digit, not a Roman numeral. (Tech.co)
5. Use capital letters. Tech.co recommends uppercase for reliability, though lowercase may work in some browsers. (Tech.co)
6. Test the product. Multiply all Roman numerals in your password. If the result is 35, you’re good. If not, adjust.
7. Plan for Rule 10. Remember that Roman numerals like V and I also count as element symbols. Make sure your atomic sum still reaches 200.

The pattern: Rule 9 is one of the few rules that can be solved with a single addition. Choose XXXV, and you’re done with both Rule 7 and Rule 9.

Confirmed facts vs. What’s unclear

The distinction between confirmed and unclear helps players decide where to trust community advice vs. official documentation.

Quotes from the community

“The best way to solve Rule 9 is to place XXXV in the password.”

— The Password Game Wiki (Fandom)

“There are only two ways to satisfy Rule 9: XXXV × I or V × VII.”

— Tech.co

“XXXV also solves Rule 9 because the Roman numerals need to multiply to 35.”

— YouTube speedrun explanation

For the community, the consensus is clear: XXXV is the simplest universal fix.

Summary

Rule 9 is a small but critical gate in The Password Game. The most reliable solution is to add XXXV, which satisfies both the Roman numeral requirement and the multiplication rule. For players aiming for a speedrun, the choice is obvious: use XXXV as your single Roman numeral, then build the rest of the password around it. For those who already have a Roman numeral from Rule 7, the pair V and VII works, but you must separate them with a non-Roman character. The key is to plan ahead: every Roman numeral you add becomes part of the product, and later rules like the atomic number rule will also be affected. For the player who wants to minimize backtracking, the decision is straightforward: start with XXXV, and let the rest of the password fall into place.

Frequently asked questions