Cart Logic

Each item on the shelf offers several pack sizes, coupons and flashy tags. Your job is to choose the best true value per unit for every item, keep the total under budget, and spot the one deal whose advertised saving is a lie. Get all three right at checkout to clear the round.

• Pick the lowest genuine price per unit for each item
• Keep your spend under the budget
• Flag exactly one fake deal per round
• Check out only when every item is chosen

• Desktop: click an option to add it to the cart, click the flag icon to mark a fake deal, then Check Out.
• Phone & tablet: tap options and the flag, then tap Check Out, touch supported.

• Daily: one shared seeded shelf per day
• Practice: fresh shelves at Easy, Medium or Hard

• Always compare the per-unit price, never the pack price, bigger isn't automatically cheaper
• Apply the coupon math before deciding; a percentage off a small pack can beat a dollar off a big one
• The flashiest tag is usually the fake, verify its claimed saving against the real unit cost

Cart Logic builds unit-price literacy and everyday economics, turning smart grocery shopping into a skill you practise.

• Skills: unit price, comparison shopping, consumer math, everyday economics
• Best for: roughly grades 4–10 (ages 9–16)
• For parents & teachers: practical money math for everyday shopping.

Choosing the best true unit price across pack sizes, coupons and flashy tags is the arithmetic supermarket shelves are designed to discourage.

Including the decoys is the original honesty.

Unit pricing exists as a consumer protection because the comparison is genuinely hard: pack sizes are chosen so the division is awkward, and a coupon can make the larger size worse value than it appears. Doing the sums is the only defence.

Cart Logic is an original free browser game about everyday economics and unit-price literacy, turning smart grocery comparison into a timed puzzle. Built in-house for PlayPendium.

A free, original browser game on PlayPendium. No download, no install.