Horror Games — Play Free Online

Horror games are about powerlessness. You can't fight — only hide, run, or survive until morning. The best horror games understand that fear comes not from the monster, but from the player's inability to stop the monster. A shotgun in a horror game isn't a horror mechanic; a locked door with limited power is.

CalcBot's horror collection includes the indie horror titles that defined the genre on the browser. Five Nights at Freddy's is the 2014 indie horror landmark — you're a night security guard at a pizza restaurant, the animatronics walk the halls after midnight, and you have to survive until 6am using only cameras, doors, and limited power. FNAF 2 expands the formula with more animatronics, no doors to hide behind, and a music-box mechanic. Granny is a first-person escape horror — wake up in a house with a murderous grandmother, find the keys, get out before she finds you.

Horror games on CalcBot run natively in your browser. Most are mouse-driven (FNAF series) or use WASD + mouse-look (Granny). Headphones are strongly recommended — directional audio is half of horror survival.

Horror games are also surprisingly short. A typical FNAF night lasts 4-8 minutes (in-game time); a Granny run lasts 15-30 minutes. The intensity more than makes up for the brevity.

All horror games (3)

Five Nights at Freddy's

Granny

Five Nights at Freddy's 2

Why Play horror Games on CalcBot?

Includes the foundational indie horror titles (FNAF 1, FNAF 2, Granny).
Short, intense sessions — perfect for a controlled scare.
No downloads, no installs — horror in your browser, instantly.
Free to play, with no in-game purchases.
Curated for atmosphere — every title has stood the test of time.

What Makes a Great horror Game?

A great horror game limits the player's power. The scariest games aren't the ones with the most monsters — they're the ones where the player has the fewest tools. FNAF gives you doors but charges you power for using them. Granny gives you a hiding spot but the Granny can hear you. The constraint is the horror.

A great horror game also has audio that does the heavy lifting. Footsteps, breathing, music stings, and silence — these are the building blocks of dread. The visual scares are just the payoff; the audio is what builds the tension.

Finally, a great horror game respects the player's intelligence. The threats should be readable — once you learn the pattern, you should be able to survive. Random deaths are frustrating, not scary. Pattern-based deaths are terrifying because they're your fault.

Frequently Asked Questions

Are these horror games appropriate for children?▾

No. All horror games on CalcBot are rated T (Teen) or higher by their original publishers. They contain jump scares, violence, and disturbing imagery. We recommend parental discretion for players under 13.

How do I survive Five Nights at Freddy's?▾

Conserve power. Every closed door and lit camera drains your power meter, and if you run out before 6am, you're defenseless. Only close doors when you actually hear or see a threat at that door. Check cameras in patterns — once you learn each animatronic's route, you'll know when to check.

Why are horror games so short?▾

Horror is an intense emotion that can't be sustained for long periods. The best horror games are short by design — 5-30 minutes of intensity is more effective than 5 hours of fatigue. FNAF's 4-8 minute nights are perfectly paced for sustained dread without exhausting the player.

Should I play horror games with headphones?▾

Yes. Directional audio is half of horror survival — you'll often hear a threat before you see it. Headphones also block out real-world distractions, which heightens immersion and makes the scares land harder.

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About Our horror Games Collection

CalcBot's horror game collection brings the foundational indie horror titles to your browser — from the animatronic dread of Five Nights at Freddy's to the escape-room tension of Granny. Every title on this page has been chosen for its atmosphere, its pattern-based scares, and its respect for the player's intelligence. Headphones recommended, lights optional. Bookmark this page for your next controlled scare.

Browse all 100+ games on CalcBot →

🔄 Unit Converters

📏 Length

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💡 Tips for Students

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Quick Percentage Tip

To find X% of Y, multiply: X% × Y. To add X% to Y: Y × (1 + X/100). To subtract X%: Y × (1 − X/100). Example: 20% off $80 = $80 × 0.80 = $64.

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Multiply by 11

To multiply a two-digit number by 11, add the digits and place the sum between them: 35 × 11 → 3(3+5)5 = 385. If the sum exceeds 9, carry over: 78 × 11 → 7(7+8)8 → 7(15)8 → 858.

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Significant Figures

When multiplying/dividing, the result should have the same number of significant figures as the least precise input. When adding/subtracting, match the least number of decimal places.

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Factoring Quadratics

For ax² + bx + c, find two numbers that multiply to ac and add to b. Then split the middle term and factor by grouping. If b²−4ac is a perfect square, it factors nicely over integers.

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Squaring Numbers Ending in 5

To square a number ending in 5: multiply the remaining digits by (itself + 1), then append 25. Example: 85² = 8×9 = 72, so 85² = 7225. 35² = 3×4=12, so 35² = 1225.

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The 68-95-99.7 Rule

In a normal distribution: ~68% of data falls within 1σ, ~95% within 2σ, and ~99.7% within 3σ of the mean. Useful for quick probability estimates in statistics.

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Fraction to Decimal Patterns

1/7 = 0.142857..., 1/6 = 0.1666..., 1/8 = 0.125, 1/9 = 0.111..., 1/12 = 0.0833... Memorizing common fractions speeds up mental math significantly.

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Cross-Multiplication

To solve proportions a/b = c/d, cross-multiply: a×d = b×c. This works for any proportion and is the fastest way to find a missing value. Example: 3/4 = x/20 → 3×20 = 4x → x = 15.

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Quadratic Formula

For ax² + bx + c = 0: x = (−b ± √(b²−4ac)) / 2a. The discriminant Δ = b²−4ac tells you: Δ > 0 = two real roots, Δ = 0 = one repeated root, Δ < 0 = two complex roots.

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Difference of Squares

a² − b² = (a+b)(a−b). This is one of the most useful factoring patterns. Use it backwards to quickly multiply: 97 × 103 = (100−3)(100+3) = 10000 − 9 = 9991.

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Probability Basics

P(A or B) = P(A) + P(B) − P(A and B). For independent events: P(A and B) = P(A) × P(B). Complement rule: P(not A) = 1 − P(A). Total probability always equals 1.

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Long Division Shortcut

To check if a number is divisible: by 2 (even), by 3 (sum of digits divisible by 3), by 4 (last two digits divisible by 4), by 9 (sum of digits divisible by 9), by 5 (ends in 0 or 5).

Educational Materials

Comparing Numbers

On the number line, the number to the right is always greater. Positive numbers are greater than zero, and zero is greater than negative numbers. For any two real numbers a and b:

if a − b > 0, then a > b; if a − b < 0, then a < b; if a − b = 0, then a = b.

When comparing negative numbers, the one with the smaller absolute value is greater: −3 > −7 because |−3| < |−7|. To compare fractions, convert them to a common denominator or to decimal form. For example, to compare 3/7 and 2/5: 3/7 = 15/35 and 2/5 = 14/35, so 3/7 > 2/5.

Key rules: (1) If a > b and b > c, then a > c (transitivity). (2) If a > b, then a + c > b + c for any c. (3) If a > b and c > 0, then ac > bc; but if c < 0, then ac < bc — multiplying by a negative reverses the inequality. (4) The reciprocal of a larger positive number is smaller: if a > b > 0, then 1/a < 1/b.

Fractions

A common fraction a/b (where b ≠ 0) represents parts of a whole. Equivalent fractions represent the same value: a/b = (a·k)/(b·k) for k ≠ 0. Reducing a fraction means dividing numerator and denominator by their greatest common divisor (GCD). For example, 18/24 = (18÷6)/(24÷6) = 3/4.

Decimal fractions use place values: 0.75 = 75/100 = 3/4. To compare decimal fractions, align decimal points and compare digit by digit. A terminating decimal is a fraction with denominator a power of 10; a repeating decimal like 0.3̄ = 3/9 = 1/3. The general rule: 0.ᾱ = a/9, 0.āb̄ = (10a + b)/99.

To add or subtract fractions, find the least common denominator (LCD) — the LCM of the denominators. For example: 1/6 + 3/8: LCM(6,8) = 24, so 1/6 + 3/8 = 4/24 + 9/24 = 13/24. To multiply: (a/b)·(c/d) = (ac)/(bd). To divide: (a/b) ÷ (c/d) = (ad)/(bc), where c ≠ 0.

Inverse Proportionality

Two quantities x and y are inversely proportional if their product is constant: x · y = k, or equivalently y = k/x, where k ≠ 0 is the constant of inverse proportionality. The graph of y = k/x is a hyperbola with two branches in quadrants I and III (when k > 0) or II and IV (when k < 0). As x increases, y decreases, and vice versa — but they never reach zero.

Key properties: (1) If x is multiplied by a factor n, then y is divided by n (e.g., if x doubles, y halves). (2) The product of any pair of corresponding values is always k. (3) The function y = k/x is undefined at x = 0 and never crosses either axis.

Typical problems: If 6 workers complete a job in 10 days, how many days for 15 workers? Since workers × days = constant: 6 × 10 = 15 × d, giving d = 4 days. Similarly, if a car traveling at 60 km/h takes 3 hours, at 90 km/h it takes 60×3/90 = 2 hours. Always verify that the product remains constant.

Inequalities with Parameters

A linear inequality with a parameter has the form ax + b > 0 (or <, ≤, ≥). The solution depends on the parameter a: if a > 0, then x > −b/a; if a < 0, the inequality sign reverses: x < −b/a; if a = 0 and b > 0, every x is a solution; if a = 0 and b ≤ 0, there is no solution. Always analyze the critical parameter values where the coefficient of x changes sign.

For quadratic inequalities ax² + bx + c > 0, first find the discriminant D = b² − 4ac. If D < 0 and a > 0, the entire parabola is above the x-axis — all real x satisfy the inequality. If D > 0, find roots x₁ and x₂, then the sign of ax² + bx + c matches the sign of a outside the interval [x₁, x₂] and is opposite between the roots.

The graphical method is powerful: sketch the parabola y = ax² + bx + c and identify where it is above or below the x-axis. When parameters are involved, consider cases: D > 0 (two distinct roots), D = 0 (one double root), D < 0 (no real roots). For each case, determine the solution set based on the sign of a and the direction of the inequality.

Rational Inequalities

A rational inequality involves a fraction with polynomials, such as P(x)/Q(x) > 0. The interval method (also called the sign chart method) is the standard approach: (1) Find all zeros of P(x) and Q(x). (2) Plot these points on a number line (use open circles for zeros of Q(x) since they are excluded from the domain). (3) Determine the sign of the expression in each interval. (4) Select intervals matching the inequality sign.

The rightmost interval always has the sign determined by the leading coefficients of P(x) and Q(x). Signs alternate when crossing a root of odd multiplicity but stay the same when crossing a root of even multiplicity. For example, for (x−1)²(x+2) / ((x−3)(x+1)) > 0, the sign does not change at x = 1 (even power) but does at x = −2, x = −1, and x = 3.

Common mistakes: (1) Multiplying both sides by a denominator without knowing its sign — this can reverse the inequality. (2) Forgetting that zeros of the denominator are never included in the solution. (3) Including roots of the numerator for strict inequalities (> or <) — these should be excluded. (4) Not checking whether the expression is defined at boundary points. Always bring everything to one side as a single fraction before applying the interval method.