Hello, thanks for your question. No the Lenovo 7i 14" laptop model # 82BH0006US does not come with a stylus. We recommend the Wacom Bamboo pen featured in the link. https://www.bestbuy.com/site/wacom-bamboo-ink-smart-stylus-for-windows-ink-2nd-generation-gray/6374981.p?skuId=6374981

Yes. You can upgrade the Windows 10 S-Mode 64-bit Operating System within this Lenovo IdeaPad 3 15 Laptop, model number 81WE011UUS, by purchasing the Windows 10 Pro 64-bit upgrade and installing it on this computer.

Yes, so long as the keyboard and mouse are USB-based (wired or wireless receiver) and are compatible with the Windows 10 S-Mode Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost.

That really will depend on the requirements and compatibility of the specific game you want to play. The Lenovo IdeaPad 3 15 Laptop, model number 81WR000FUS, ships with Windows 10 S-Mode 64-bit Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost. We recommend you check with the specific game's software publisher's web site for their compatibility with Windows 10 S-Mode 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration.