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Circuit puzzle

STROM

“Build the circuit. Press test. Let it shine.”

Switches on the left, lamps on the right, and in between you build the circuit from wires and gates. Then the test runs step by step: the switches change, current flows visibly through your wires, and every lamp has to light exactly when it should.

  • Coming to Google Play
  • Coming to the App Store
STROM home screen: the S T R O M wordmark, the Condition world with 14 of 16 levels solved and the Keep building button.
STROM board, level 5 of the Arithmetic world: the test is at step 7, current glows through wires, splitters, crossings and a delay up to two lamps; above, the test table.
STROM world overview with illustrated worlds: Condition, Either, Logic, Clock, Memory and Arithmetic.

Screenshots from the current version of STROM

How it works

Wire it, test it, let it shine

  1. Read the table

    The test table shows which lamp should light for which setting of the switches.

  2. Wire it up

    Build the circuit from wires, splitters and gates like NOT, AND and XOR.

  3. Run the test

    Current flows visibly, step by step. If every lamp lights exactly when it should, the level is solved.

At a glance

STROM in numbers

  • 10Worlds
  • 160Levels
  • 8Parts
  • 0Time pressure
  • Ten worlds, from the first Hook-up to Arithmetic.
  • Eight parts: wire, crossing, splitter, NOT, AND, XOR, delay and latch.
  • A test table shows, step by step, which lamp should light – and where your circuit is off.
  • Delays and latches bring in time: clocks, blinkers and small memories.
  • Every level has a checked reference circuit. Can you match it with as few parts?

Worlds

10 worlds of 16 levels each

  1. Hook-upSwitch to lamp
  2. CrossingOver the top
  3. Fan-outOne for all
  4. InverterOn means off
  5. ConditionOnly if both
  6. EitherExactly one
  7. LogicBuild the table
  8. ClockWhat just was
  9. MemoryRemember and forget
  10. ArithmeticCount and add

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