It’s absolutely free to download and play with some restricted advertisements. You'll find in-app buys, but they are all for personalisation things so it’s completely optional and it doesn’t affect gameplay. Ten years in the past, developer Riley Testut produced the GBA4iOS emulator for iOS, and since it was from https://www.google.tg/maps/d/viewer?mid=1kcbHo1F77bpnGr5za84Y8LoBG6D1t70