Adding a time challenge mode could be an interesting variation or potentially be the default scoring mechanism.
For example, the round could start with 1000 points and count down to 0. Correct answers are awarded the amount remaining. Incorrect answers are awarded nothing. A difficulty setting can be added for variation to the rate at which the points decrease.

Add a simple interface to select the difficulty and the mode to be used at the start of a new game.

List of distorted flags according to severity:

• Slovenia
• Vietnam
• New Zealand
• Paraguay
• Tuvalu
• Jamaica

Currently a new game is started when the browser is refreshed. This will be an improvement once #3 is resolved.

The current layout is best suited for narrow screens in portrait mode. Perhaps additional layouts can be implemented based on orientation and width.

Progressive Web App 73

• The page body should render some content if its scripts are not available.
• Failures: Manifest does not have icons at least 512px, Manifest does not have background_color.
• Failures: No <meta name="theme-color"> tag found.

Performance 45

• First meaningful paint 7,850 ms
• First Interactive (beta) 8,320 ms
• Consistently Interactive (beta) 8,320 ms
• Perceptual Speed Index: 8,687 (target: < 1,250)

There are anomalies in the flag

Currently the score (and counter) doesn't have a persistence mechanism. Using localStorage should be sufficient.

Possible additional modes:

• Match Flag to Country
• Match Capital to Country
• Match Country to Capital
• Identify Neighbouring Countries
• Country Search
• Country Detail View

Consider adding a High Score mechanism.

• Belarus
• Dominica
• East Timor
• Fiji
• Guinea Bissau
• Hungary
• Kazakhstan
• Kuwait
• Macedonia
• Micronesia
• Oman
• Palestinian Territory
• Saint Lucia
• Seychelles
• Slovenia
• Solomon Islands
• Sudan
• UAE
• United Kingdom
• Zimbabwe

• update svg/ukr.svg

• update svg/fsm.svg

Currently the only way to know if the selected answer was correct or incorrect is if the score increments. Maybe adding colours will be enough; the correct answer being green and if there is an incorrect answer, it could be red.