A clear player decision.
Observation, logic, memory or timing determines the result. The game has no payout mechanism.
A mountain distance calculationTime the echo.
Time the echo.
Find the lake.
A survey pulse crosses the granite basin and returns from the hidden strike. Convert each echo time into distance and log five correct mountain readings.
Power the echo scopePTFREE PLAY
NO PURCHASE
NO PURCHASE
PORTUGAL FIELD GAME
Serra Echo Scope
Distance equals echo time multiplied by 0.343, then divided by two.
000 ms
DISTANCE = TIME × 0.343 ÷ 2
Built from its landscape.
Regional craft, water, architecture and working instruments shape both the visual system and the rules.
Nothing is wagered.
No account, payment, cash prize or redeemable item is offered. A best result may stay on this device.