PICK A CARD. FIND A PATTERN.

The practice drawer.

500 original challenges. Pick an index card and give it a go.

New problem

New to coding? The optional Foundation lessons can help.

STATUSPROBLEMDIFFICULTYTOPIC

Receipt arithmetic: Proof stripLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Receipt arithmetic: Total receiptLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Receipt arithmetic: Threshold fileLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Receipt arithmetic: First qualifying slipLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Receipt arithmetic: Peak ticketLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Receipt arithmetic: Boss receiptLevel 0 · Variables and expressionsEasy

Variables, loops, functions and conditionalsVariables and expressions

Stamp gates: Proof stripLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Stamp gates: Total receiptLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Stamp gates: Threshold fileLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Stamp gates: First qualifying slipLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Stamp gates: Peak ticketLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Stamp gates: Boss receiptLevel 0 · ConditionalsEasy

Variables, loops, functions and conditionalsConditionals

Ribbon totals: Proof stripLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Ribbon totals: Total receiptLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Ribbon totals: Threshold fileLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Ribbon totals: First qualifying slipLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Ribbon totals: Peak ticketLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Ribbon totals: Boss receiptLevel 0 · Loop accumulatorsEasy

Variables, loops, functions and conditionalsLoop accumulators

Reset tallies: Proof stripLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Reset tallies: Total receiptLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Reset tallies: Threshold fileLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Reset tallies: First qualifying slipLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Reset tallies: Peak ticketLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Reset tallies: Boss receiptLevel 0 · State in a loopEasy

Variables, loops, functions and conditionalsState in a loop

Digit workshop: Proof stripLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Digit workshop: Total receiptLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Digit workshop: Threshold fileLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Digit workshop: First qualifying slipLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Digit workshop: Peak ticketLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Digit workshop: Boss receiptLevel 0 · Helper functionsEasy

Variables, loops, functions and conditionalsHelper functions

Neighbor notes: Proof stripLevel 1 · Adjacent array positionsEasy