Katapuuult

A session-based physics game where players launch a projectile from a catapult, collecting bonuses and avoiding hazards mid-flight. Outcomes are determined by pure player skill — angle and power are entirely chosen by the player.

Property	Value
Game ID	katapuuult
Type	session_based
Volatility	Medium
Max Win	10× bet
RTP Range	85–99.99% (configurable)

Game Phases

AIMING → CHARGING → FLIGHT → LANDED

Phase	Description	Player Input
AIMING	Player adjusts the launch angle	Angle control (25°–80°)
CHARGING	Player holds to charge launch power	Power control (hold duration)
FLIGHT	Projectile is in the air, collecting items	None (physics simulation)
LANDED	Projectile has landed, round is resolved	None

Pure Skill Mechanic

No RNG During Flight

The launch angle and power are entirely chosen by the player. There is NO RNG involved in the projectile's flight path. The physics simulation is fully deterministic given the launch parameters.

The only RNG is used at session initialization (~564 random values) to determine the placement of collectibles and hazards on the field. This placement is committed via the provably fair system before the player launches.

Zone Multipliers

The field is divided into altitude zones. The base zone multiplier is applied to the bet based on where the projectile lands:

RTP_96 Zone Multipliers

Zone	Altitude Range	Multiplier
Ground	0–50px	0.1×
Low	51–150px	0.3×
Medium	151–300px	0.5×
High	301–450px	1.0×
Very High	451–600px	1.5×
Stratosphere	601–800px	2.5×
Space	801px+	4.0×

Zone Multipliers by RTP Variant

Zone	RTP_92	RTP_94	RTP_96	RTP_97
Ground	0.0×	0.05×	0.1×	0.15×
Low	0.1×	0.2×	0.3×	0.4×
Medium	0.3×	0.4×	0.5×	0.6×
High	0.6×	0.8×	1.0×	1.2×
Very High	1.0×	1.2×	1.5×	1.8×
Stratosphere	1.5×	2.0×	2.5×	3.0×
Space	2.5×	3.0×	4.0×	5.0×

Collectible Bonuses

Collectibles are placed on the field at session start. Flying through a collectible adds its bonus to the round total:

Collectible	Bonus	Frequency
Coin	+0.2×	Common
Gem	+0.5×	Uncommon
Star	+1.0×	Rare
Crown	+2.0×	Very Rare
Rainbow	+3.0×	Legendary

Hazard Penalties

Hazards reduce the round total when the projectile collides with them:

Hazard	Penalty	Frequency
Cloud	−0.1×	Common
Bird	−0.3×	Uncommon
Lightning	−0.5×	Rare
UFO	−1.0×	Very Rare

INFO

The minimum payout is always 0× — penalties cannot result in a negative payout. The player never loses more than their bet.

Physics Engine

Parameter	Value
Gravity	900 px/s²
Simulation Rate	60 Hz
Launch Speed Range	760–2,500 px/s
Launch Angle Range	25°–80°
Air Resistance	None (ballistic trajectory)
Collision Detection	Circle-based (radius: 12px)

Trajectory Formula

The projectile follows a standard ballistic trajectory:

x(t) = x₀ + v₀ × cos(θ) × t
y(t) = y₀ + v₀ × sin(θ) × t - ½ × g × t²

Where:

• v₀ = launch speed (760–2,500 px/s)
• θ = launch angle (25°–80°)
• g = 900 px/s²
• t = time in seconds

RNG at Session Init

At the start of each session, approximately 564 RNG values are consumed from the provably fair system to determine:

• Positions of all collectibles (x, y coordinates)
• Positions of all hazards (x, y coordinates)
• Types and values of each collectible
• Types and penalties of each hazard

These placements are committed before the player sees the field, ensuring fairness.

Payout Calculation

totalPayout = max(0, zoneMultiplier + sum(collectibleBonuses) - sum(hazardPenalties))
finalPayout = min(totalPayout, 10.0) × betAmount

Example Round

Player sets angle: 62°
Player charges power: 1,800 px/s
Launch!

Flight path:
  t=0.5s: Collects Coin (+0.2×) at altitude 380px
  t=1.0s: Hits Cloud (-0.1×) at altitude 520px
  t=1.5s: Collects Star (+1.0×) at altitude 490px
  t=2.1s: Lands in "Very High" zone (1.5×)

Payout: 1.5 + 0.2 - 0.1 + 1.0 = 2.6× bet