Deliveries

Content in Super Mario Maker is unlocked by a time schedule based on Deliveries.

Arrival of deliveries is based on time and activity in the editor. So far the following has been observed: Based on random observation by continuously placing blocks, a delivery notification appeared after 280 placed blocks, and after this a fast delivery appeared after exactly 1000 blocks were placed.
 * Fast deliveries can only occur if you have updated Mario Maker to v1.01.
 * A normal delivery will arrive 24 hours (idle or otherwise) after the previous delivery (of either type) or the first boot of the game. The message A Delivery Truck Has Arrived! will appear.
 * After any delivery, there is a 15 minute window during which no delivery can occur.
 * A fast delivery occurs when there are no unused elements available (as indicated by red blocks on the selectors) and a minimum number of blocks has been placed.
 * When a number of blocks have been placed, a message giving a previous of what is in the next delivery will appear. This indicates that you are about halfway?? to the number of blocks required for a fast delivery. It does not affect the speed of normal delivery and this message does not need to appear for a normal delivery to occur.
 * When the required number of blocks has been placed a fast delivery will occur and the message Oh! A Delivery Truck has arrived. That's a bit sooner than we were expecting! will appear.
 * Time spent playing courses has no effect on fast deliveries, nor does time idling in the editor. You can however speed up fast deliveries by placing large numbers of blocks. Rapidly filling levels with regular bricks by wiggling the stylus around randomly does work.

The contents of deliveries are as follows:
 * Initial: Block, Question Block, Hard Block, Ground, Pipe, Super Mushroom, Coin, Trampoline, Goomba, Koopa Troopa, Piranha Plant, Wings, Ground Theme, Underground Theme, Super Mario Bros, Super Mario Bros U
 * First Delivery: Lakitu, Spiny, Moving Platform, Fire Flower, Super Star, 1-up Mushroom
 * Second Delivery: Bill Blaster, Blooper, Cheep Cheep, Spike Trap, Semi Solid Platform, Underwater Theme
 * Third Delivery: Castle Theme, Hammer Brother, Buzzy Beetle, Thwomp, Lava Bubble, Bowser, Note Block, Lava Lift, Fire Bar, View Trail Command
 * Fourth Delivery: Super Mario Bros 3, Rocky Wrench, Bob-omb, Donut Block, POW Block, Cloud Block, Burner, Cannon, Fence, Airship Theme, Timer and Autoscroll Settings
 * Fifth Delivery: Super Mario World, Ghost House Theme, Spike Top, Boo, Dry Bones, Magikoopa, Hidden Block, Vine, P-Switch, Warp Door. Mystery Mushroom, Super Leaf, Cape Feather, and Propeller Mushroom (depending on the style) are also unlocked if they were not already.
 * Sixth Delivery: Sound Effects Tool, Muncher, Wiggler, Shoe Goomba/Yoshi Egg, Koopa Clown Car, Mushroom Platform, Arrow Sign.
 * Seventh Delivery: Track, Conveyor Belt, Grinder.
 * Eighth Delivery: Chain Chomp, Ice Block, One Way, Sub Area Tools; and a notice that all course elements are now unlocked.
 * Special cases: Mystery Mushroom (unlocked as soon as a costume becomes available), Big Mushroom (unlocked only via Amiibo), and Weird Mushroom (unlocked after completing all 4 Nintendo World Championship levels)