Tetris mode ideas

Ice Storm: "Hold back the rising ice columns."
Inspired by: Ice Storm [Bejeweled 3]

In Ice Storm, columns of ice extrude from the bottom of the field toward the top, similar to the mode of the same name from Bejeweled 3. You can destroy ice columns by clearing a certain number of lines. Clearing 1 line will not do anything. 2 lines will push the columns down by 10%, 3 lines will push them down by 25%, and 4 lines will do so by 50%.
As the game progresses, the rate in which columns rise increases. There is a score multiplier, with a bar that shows the progression to the next multiplier. When  it's full, the top of the field releases steam that pushes the columns down. Refilling the bar after each time it empties requires clearing more ice.
There is a 2% chance that flashing pieces that push as twice may appear every now and then. When the ice column reaches the top, a skull icon appears over the column, the "WARNING!" text that flashes yellow is displayed at the bottom, and an "internal" column begins to rise. Pushing down or destroying the original ice column removes the secondary column. If the internal column approaches the top, various things that intensify the situation occur (a warning sound plays, the background darkens, "WARNING!" changes to "CAUTION!!" when the secondary column is halfway to the top in addition to having it flash orange, etc.).
When this secondary ice column reaches the top, the skull icon above the column turns red and enlarges, with the "CAUTION!!" text changing to "DANGER!!!", which flashes red rapidly. If the column is not pushed down or destroyed within a few seconds, the game ends in which the entire field freezes over.

Time Frenzy: "Clear lines with time blocks to charge up bonus rounds."
Inspired by: Lightning [Bejeweled 3]

The game starts with one minute on the timer. The objective is to get the highest score as possible until the time limit runs out. By performing line clears in quick succession, Speed Bonuses and Blazing Speed bonuses can be earned that award additional points to the score.
Exclusive to this mode are unique Time Blocks, which have a number in one of the blocks in this piece, indicating the time extension amount in seconds. As soon as the line with a Time Block is cleared, it will add the amount of seconds displayed in it to the extra time bar. The maximum amount of time that can be stored at once is one minute. When the time limit reaches zero, the stored time is added back to the time limit and the extra time bar resets. Progressing through the game reduces the chances of Time Blocks, which makes it more difficult to extend time each time the bar empties.
Another mechanic is the Score Multiplier. Each time the extra time bar resets, the Score Multiplier increases by one. When the time runs out without extra time, a cascade occurs, adding points based on the number of lines cleared during that time. The game ends when the cascade has concluded.

Drop Dash: "Score quickly with four minutes, no holding, one next preview, and a level system."
Inspired by: A version of Tetris Dash. The video: https://www.youtube.com/watch?v=LKjyha4tRJ8

The objective of this mode is to score as many points as possible within four minutes. Levelling up is possible, increasing drop speed and the score multiplier. Unlike Marathon, it is not possible for the player to get past Lv. 10. In addition, it is not possible to hold a piece, and there is one next preview. If the time limit runs out, the game ends.

Excavator: "Dig deep to unearth buried treasure."
Inspired by: Diamond Mine [Bejeweled 3]

The goal is to clear as many garbage lines as possible within the time limit. The game starts with 13 garbage lines on the field, along with a 90-second time limit. The Dig Line is located at the top of the third row. When the row above the Dig Line is cleared, more garbage will appear at the bottom to simulate digging deeper into the ground, and a depth indicator will increase by 2 meters. The player has 3 seconds to clear more lines before garbage rises.
Clearing the garbage line above the Dig Line will add 30 seconds to the clock. When all garbage lines are cleared, it will add 90 seconds. If a line clear is also a Perfect Clear, the time is extended by 300 seconds. When the field is 250 meters or deeper, the time bonuses are reduced significantly. The respective time bonuses given are 25, 70, and 200 seconds. At 500 meters and above, all of these three actions give much less time: 15, 50, and 100 seconds.
When the player reaches at least 150 meters, the game will introduce a new type of garbage lines, which have multiple holes, ranging from 2 to 5. Hidden gem blocks can be found in some garbage lines. The following point value for each color is as follows:

Common (50%):
Red = 500 pts
Blue = 750 pts
Uncommon (30%):
Yellow = 1,250 pts
Rare (8%):
Green = 1,500 pts
Super Rare (5%):
Orange = 3,000 pts
Ultra Rare (4%):
Green = 7,000 pts
Legendary (3%):
Light Blue = 12,500 pts

The game will end when the time runs out.