The 240x320 resolution was a common screen size for older mobile devices. This resolution is still supported by some mobile emulators and devices.
You're looking for information on the classic game Snake Xenzia, specifically a version with a 240x320 resolution JAR file from 2021. Here's what I found: snake xenzia 240x320 jar 2021
A JAR (Java Archive) file is a compressed file format used to distribute Java applications. In the context of mobile games, JAR files were commonly used for Java-based mobile phones. The 240x320 resolution was a common screen size