The flags below are shown exactly as they appear in the quiz, in the same 4:3 frame, so proportions are no help and you have to rely on colours, order and details. On the Hard level of the flags mode these are exactly the kind of options you will be offered together.
Two pairs are a special case. Chad and Romania, and Indonesia and Monaco, are almost identical in this flag set (only the shades differ), so the quiz never offers them in the same question. Everything else on this page can and does come up together.
Ireland · Côte d’Ivoire
Same three colours, opposite order. Ireland has green next to the pole, Côte d’Ivoire has orange there.
Bulgaria · Russia
White on top and red at the bottom in both. The middle band decides: green for Bulgaria, blue for Russia.
Italy · Mexico
Green, white and red in vertical bands. Mexico has an emblem with an eagle in the middle; Italy is plain.
Colombia · Ecuador
Yellow, blue and red with a wide yellow band. Ecuador carries a coat of arms in the centre; Colombia has none.
Mali · Senegal
Green, yellow and red bands. Senegal has a green star in the middle; Mali is plain.
Moldova · Romania
Blue, yellow and red bands. Moldova has a coat of arms in the yellow band; Romania is plain.
Netherlands · Paraguay
Red, white and blue bands. Paraguay has a round emblem in the white band; the Netherlands are plain.
Indonesia · Singapore
Red over white. Singapore adds a white crescent and five white stars in the top corner by the pole.
Denmark · Norway
Red with a cross. Denmark’s cross is white; Norway’s is blue with a white border.
Iceland · Sweden
Blue with a cross. Iceland’s cross is red with a white border; Sweden’s is yellow.
Australia · New Zealand
Blue with the Union Jack and stars. Australia has white stars, including a large one under the Union Jack; New Zealand has four red stars with white edges.
Bahrain · Qatar
A white band with a serrated edge next to the pole. Bahrain is bright red with five white points; Qatar is a deep maroon with more, smaller points.
Chile · Czechia
White, red and blue. Chile has a blue square with a white star in the top corner; Czechia has a blue triangle reaching in from the pole.
Hungary · Tajikistan
Red, white and green bands. Tajikistan has a golden crown under an arc of stars in a wider white band; Hungary’s bands are equal and plain.
Egypt · Iraq
Red, white and black bands. Egypt has a golden eagle in the white band; Iraq has green writing.
Bolivia · Ghana
Red, yellow and green bands. Ghana has a black star in the middle; Bolivia has a coat of arms.
Practise these in a round of the flags mode on Hard, where similar flags are offered side by side, or pick a continent and play the country-to-flag direction until the pairs stop catching you out.