I was stuck several times with these annoying Captcha not working with Odyssey (and really really stuck since I don't always have anything else than MorphOS, notably when traveling).
Here they are: https://www.google.com/recaptcha/api2/demo
They do work if you spoof as iPad (reload the page if you change the spoofing on the fly).
It still feels difficult sometimes and I haven't got through with those street signs ever, but when you get those slower rendering ones (buses, store fronts, etc), then you usually succeed sooner or later. Just be patient and keep going and you can do it :)