You need a paid membership to Nintendo Switch Online to play course world in Super Mario Maker 2. Pretty sure you could access course world at no extra cost in the original
Nintendo Switch Online on the App Store
Amazon.com: Nintendo Switch Online + Expansion Pack 12-month Family Membership – [Digital Code] : Everything Else
נינטנדו סוויץ' אונליין - Nintendo Switch Online - מנוי ל12 חודשים
Nintendo Switch™ w/ Neon Blue & Neon Red Joy-Con™ + Mario Kart™ 8 Deluxe (Full Game Download) + 3 Month Nintendo Switch Online Individual Membership - Walmart.com
Nintendo Switch Online (Individual Membership) מנוי נינטנדו סוויץ' אונ
Buy Nintendo Switch Online 12-Month Individual Membership from the Humble Store
Nintendo Switch Online - Apps on Google Play
Nintendo Switch Online 12-month Individual Membership - Nintendo Switch (digital) : Target
Nintendo Switch Online's N64 and Sega Genesis 'expansion pack' launches October 25th for $49.99 per year - The Verge
Nintendo Switch Online Subscription Service - Nintendo Switch Guide - IGN
מנוי 365 ימים Nintendo Switch Online + Tetris 99 - vgs.co.il
The best games on Nintendo Switch Online | CNN Underscored
Nintendo Switch Online - Every NES, SNES, N64, Sega Genesis, Game Boy, And GBA Game Available | Nintendo Life
Nintendo Switch Online + Expansion Pack - מנוי 365 יום - נינטנדו ישראל
Nintendo Switch OLED with Online 12 Month Family Membership and Surge 11-In-1 Accessory Starter Pack Bundle NS-HEGSKAAAA/SG60047 White - US
Everything you need to know about Nintendo Switch Online | Digital Trends
Nintendo Switch Online: How to sign up for the paid multiplayer service - CNET
Nintendo Switch Online Review | PCMag
Nintendo Switch Online vs Nintendo Switch Online Expansion Pack: which is right for you? | TechRadar
Nintendo Switch Online + Expansion Pack | Nintendo Switch Online | Nintendo
Everything you need to know about Nintendo Switch Online | Digital Trends
Nintendo Switch Online Review | PCMag
מה זה Nintendo Online? פיצ'רים ומשחקי נינטנדו אונליין - נינטנדו ישראל
How to Set Up And Use the Nintendo Online Family Plan