Please add a "LOCK" feature so we can at least LOCK and SAFEGUARD 20 Monsters at a time. I find it too easy to sell Legendary and Epics monsters by accident. My 4 year old saw my phone and accidentally SOLD Frostbite lvl 100 with 3 single speed runes level 5 and 6. I hope SP can help recover such accidents and also to help prevent future accidents by many players.

Thank you.

I am not sure what kind of lock you are looking for, there is already a confirmation button. You will do better to ensure your 4 year old doesn't access your game.

It's not just kids accessing my game, i have read others have done accidental selling. The lock feature is maybe a check box under the monster to keep it in a safe so it can't be extract or sold without unchecking the box. Maybe that is too much to ask from developers to make it harder to simply sell your epics and legendary monsters. By the way, when you sell your monster you will lose all runes on them unlike extraction where the runes goes back to storage. I am sure you will feel differently if this happens to you. Anyway, happy gaming!!!

I would suggest passwording your device or pc so others can't access your game. As Nynaevelan said, there is already a confirmation feature when you try to sell your monsters.

Adding additional features to what's already in place isn't really necessary. And before you ask, yes I have hit that confirm button when I really didn't mean to. It tends to make me a little more careful during late night game sessions.

It happened to me too, I did the selling all by myself (no child involved) while feeding my first Ouros during a progressive island. I was so used to breeding a pandaken or greenasaur feeding them till I got a feeding token, and i thought its feeding time I use this time the food to give to Ouros and as soon as I got the food token I sold my Ouros, I was not a happy puppy at that moment when it sunk in what I had done, but it never crossed my mind to ask for an extra feature to undo this and it never happened to me again!
I get you are frustrated this happened but I think its your responsibility that your kid cant use your device and not SP's

I sold something accidently on another monster game I play, and they restored it to my account after I filled out a support ticket. Have you tried that?

I tried this when my 3-year old sold one of my Hacksters that was hatching. Sp said they had no evidence I had sold a hackster. One was sold, though. Sigh. Maybe they knew his cells would go on sale in a few hours. I gave them more gems of course for the cells since I was about 40 shy of being able to rank him to 130.

I accidentally sold an L before, from the hatchery (spam breeding/selling Pandaken in an event). Totally my fault.

I sent a support ticket with a screenshot from that monster's monstagram page, pointing out that the screenshot (1) showed I had owned but hadn't fed him and (2) there was no magnifying glass, demonstrating I no longer had him.

I explained what had happened and asked very politely whether they would help. They added the egg to my storage and warned me this was a once off no obligation assistance.

So, ask.