Print the cards
Four cards: three numbered progression cards and one annex. Each one leaves you able to solve a cube, and each says on its own back what unlocks the next.
1. Print the set
- A4 — the whole set, one sheetStart here. Single-sided, fold, glue, cut. No duplex printer needed.
- US Letter — the whole setSame, Letter paper.
Two-sided instead? Pick the file that matches your flip setting.
- A4 two-sided, flip on LONG edgeTwo complete sets per sheet. Pick the file that matches your printer setting.
- A4 two-sided, flip on SHORT edgeSame sheet, laid out for the other flip.
- US Letter, LONG edge
- US Letter, SHORT edge
There is deliberately no single file that works under either flip. The numeral on both faces is your check — cut one card first and make sure its front and back agree.
Or reprint one card
- 1/3 — First solveA4 · Letter · bare card — four copies per sheet.
- 2/3 — Two-lookA4 · Letter · bare card — four copies per sheet.
- 3/3 — One-look PLLA4 · Letter · bare card — four copies per sheet.
- A — Annex — big cubes and the mapA4 · Letter · bare card — four copies per sheet.
2. Print at 100 %
This is the one setting that matters. Never “Fit to page”, “Shrink oversized pages”, or “Scale to fit”. Each sheet carries an 80 mm calibration bar in both margins — measure it after the first page. If it isn’t 80 mm, the scale is wrong and the card won’t fit a wallet slot.
| Acrobat / Reader | Page Sizing & Handling → Size → Actual size. Turn off “Auto portrait/landscape”. |
|---|---|
| macOS Preview | Scale: 100 % radio button (not “Scale to Fit”). Pick A4 / US Letter, not the “borderless” variant. |
| Windows / Edge | Page Sizing → Actual size. |
| Chrome | More settings → Scale → Custom → 100. Its “Default” silently shrinks. Prefer another viewer. |
Check your printer driver’s own dialog too — a driver-level “Fit to Paper Size” overrides whatever the application asked for.
3. Folding and two-sided
The default files are single-sided: print, crease the grey line, fold so both printed faces are outward, glue, then cut both layers together. That removes duplex registration error entirely, and works on printers with no duplex unit at all.
If you do want two-sided, the set ships one file per flip direction. Each card carries its number on both faces, so a wrong flip is caught after cutting one card instead of after wasting the sheet.
4. Paper and finishing
160–200 gsm feeds through most home printers. Cut on the grey hairlines — they run the full sheet, so one straight cut serves four cards.
A standard 54 × 86 mm “credit card” laminating pouch leaves about 0.4 mm of total clearance and will not seal. Either keep it wallet-sized and don’t laminate (the folded 200 gsm card is stiff enough), or use a 60 × 90 mm business-card pouch and accept that the result no longer fits a wallet slot.
Also on paper: the full PDF guide.