Large Veggie 
Larger vegetables are used in the same way as the small ones. However, collect 5 of them, and a Stopwatch will appear. These weigh more than small veggies, only Toad can heft them with no effort. 

Mushroom Block 
These mysterious mushrooms are heavy enough to be used as weapons, and durable enough to make stairs. You must press forward and hit the "B" button to toss them, otherwise, you'll just drop them. 

Mushroom 
In the Mushroom Kingdom, these were always found in "?" blocks, and would slide around when you pop them out. However, this isn't the Mushroom Kingdom, it's Sub-Con. To find a Mushroom, enter Sub-Space at a certain spot. To use one, lift it up, and you'll get a 1-point increase in your life meter. There are no more than two per level, and the extra HP diminish when you clear the area. 

Heart 
After you beat about 8 foes, this will float up in some random space on the screen. Catch it to recover 1 point of energy 

Cherry 
Relatively useless alone, collect 5 to make Starman appear. In the slot game, 1 in the first slot gives you one life, 2 gives you 2 lives, and 3 gives you 5 lives. On the All-Stars version, 3 Cherries only gives you 3 lives, but a Cherry and 2 "7"s gives you another 3 chances. Collect a Cherry in Sub-Space, and it will still be there on the regular level. A 1990 rumor had it that 32 of these gave you a Fire Flower, but that has since been extinguished. 

Bomb 
DYNAMITE!!! These explosives are often pulled up from the grass. Find some enemies or a fragile rock wall quickly, as they begin to flash and then explode after a short time. They can damage you as well as foes and walls! 

Bob-Omb 
An enemy when encountered, but an item if pulled from the grass. If that happens, toss it quick! They don't like being buried, and will blow up faster than regular Bombs or walking Bob-Ombs. 

Jar 
Sort of an item. Duck into one to find something remotely useful, like a Key, Potion, or 1-Up. Later in the game, they all seem to have the same thing inside (Shells and Shyguys), except a few of them...  If you find you can't go down a jar, look for a Potion nearby, and enter Sub-Space and try. You might find yourself in a totally WARPED situation! 

Key 
Attack enemies...  Open locked doors...  Get chased by Phanto...  That's about it for the Key points of this essential but dangerous item. 

Shell 
Pull it from the ground and toss it. It will wipe out anything that comes in contact with it until it hits a wall or ledge.  You can ride it and even pick it back up while it slides. 

POW Block 
Back from MB, now you can toss it, and it will shake the screen - and anything unfortunate enough to be on the ground at the time! These are often out in the open. hold one in Sub-Space until Sub-Space ends, and you will bring it back to the regular level and have 2 POWs! 

Potion 
Toss it down in a certain space, and enter the door. Welcome to Sub-Space the dark,
one-screen, mirror image.  Home of Mushrooms and generator of double POWs and Cherries! No enemies here, and no veggies!  Beware of any Spikes onscreen when you entered, they will still be here. Do pull the grass and harvest some Coins! Only 2 Coin harvests per level! Hope you find some Mushrooms, and please enjoy your stay! If you wish to, enter near a jar that you can't enter in the regular level. Chances are, you have stumbled across a Warp Zone! 

Coin 
Pull the grass in Sub-Space, and you'll find Coins! That is, unless you've harvested Coins twice in the same level. These will allow you to take a chance at the Bonus Game after you exit the level, but you MUST play all of them! Hope you're playing as Toad, as Coins aren't light! 

Vine/Ladder/Chain 
Up, up, and up some more! Climb the vines, ladders, or chains in various areas (e.g. World 5-2 or 6-3) to reach higher ground 

Magic Carpet 
Pidgit overboard! Now it's you on board. Fly along in the direction you've been travelling so far until you reach something solid to latch onto (Cloud, Vine, the ground). No sightseeing, as Carpets have a backup device...  They vanish at bout the time you should have gotten to something solid.  The ground never looked so good! 

Stopwatch 
Appears if you pull out 5 Large Veggies. For about 8 seconds, all enemy motion will cease, making your foes easy targets. Does NOT appear in Sub-Space. 

Invincible Starman 
Pick 5 Cherries to make this old friend appear. Now you can run around invincible, and mow down anything in your way. Lasts about 8 or 10 seconds, but can be used to kill Birdo if you catch one close to him. It can appear in Sub-Space, but if it does, you'd better get it, or it'll be gone whan Sub-Space wears out. Unlike Starmen from the Musroom Kingdom, this one rises while moving left and right. 

1-Up 
Wherever these appear, they only show up once per level!  Gives you an extra life if you pick it; usually, it will be in the grass. A couple secret mirror jars in the cave on World 6-1 have them, and at either end of the jars. But if you get one, it nixes the others (D'oh!) 

Note: 
Enemies and Items, with the exception of Keys, cannot be carried through a door or out of Jars,

Sub-Space does NOT generate double Mushroom Blocks. That's cheating (But double POWs and Cherries isn't?). If you're holding a Mushroom Block in Sub-Space, It will dissolve in your hands whan Sub-Space expires... But the original one will still be there. 

As if it hasn't been stated enough, You can't collect Coins more than twice per level.  That means you can go in and collect as many Coins as you can (Try it where the 2 Shyguys are on 1-2, or in the cave on 3-1 - Hope you brought Toad), and exit a maximum of 2 times. Small Veggies will replace Coins if you try again (These will not dissolve when Sub-Space ends).  However, you CAN enter once and collect coins, enter again for a Mushroom, or just to do nothing, then enter and collect coins again.  You may also reset the grass in the area, and collect from the same spot twice. As a bonus, it's a max of 2 times PER LEVEL!! So you can collect twice in one level, and
then warp ahead through a warp jar, and collect twice in the level you just warped to!!! Try this on 3-1 for a TRUCKLOAD of Coins! 

If there is more than one Mushroom in Sub-Space, there is only ONE MORE, and they are never in the same spot. You usually find them near the Potion vial, but sometimes, you must search... 

You can't enter Sub-Space while in a Jar. Who knows what THAT would do?!  Mario might WAKE UP!!! 

For any beginners out there, you can't swim in this game AT ALL!!!  As in SMB, do NOT jump in the water. Just because Trouter is in there doesn't mean you should be. That should be all the more reason for you to stay out! If you've played SMB before, you know what I mean. If you've played SMB3 or SMW before, don't be fooled. Swimming is NOT an opition!!!! 

HP, Mushrooms, Veggies, and Cherries are NOT cumulative, and therefore, they will NOT carry over into the next stage or world. If you exit World 3-3 with 4 (Maximum) HP, 4 Cherries, and 4 Large Veggies, you'll start World 4-1 with 2 HP, 0 Large Veggies, and no Cherries. Same applies if you warped from the previous world or two (e.g. from 1-3 to 4-1). That's cheating (But it's not with Coins?)