EGG (English Grammar Game): spot grammar mistakes and tap to fix them. Google sign-in saves progress; export to Sheets. Free Parts 1–3 for 1 week.

Detailed (EN)
EGG — English Grammar Game (Spot 'n Tap Errors) is the global name for 推し押し英文法, a reflex drill where you find and tap grammar errors, then check the explanation.

Main features
• Practice and advancement tests by Part and level
• Google sign-in with synced progress
• Export results to a new Google Spreadsheet (files the app creates only)
• Free trial: 7 days, all levels of Parts 1–3
• Paid plans via bank transfer (payer covers fees): 3 months ¥1,000 tax-in recommended, or 1 month ¥400

Publisher: Nexus Learning
App: https://oshioshi-eibunpo.nexus-learning.com

A web app that integrates with Google Sheets (not a Classroom add-on). Part of the Oshi Oshi series.