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Falling Blocks Watch Out is a 3DS homebrew Tetris clone. The aim was to create a homebrew game inspired by Tetris DS, seeing as it was one of the best Tetris installments on handhelds, without all the fanciness new games bring. Therefore, features include:

SRS (Super Rotation System) - which should allow 20G to still let the player play, not just cry in a corner. Based on https://tetris.wiki/SRS#How_Guideline_SRS_Really_Works
Not only SRS though - TGM system - ARS - has been implemented too! When using ARS, soft drop will have no lock delay, so be careful!
Bag-style Random Generator - sequence of all the 7 blocks is shuffled, then put into play, so no more than 4 Z/S in a row will occur, therefore unlimited play is possible.
Marathon mode - of course. Limited to 20 levels (hardcoded, sorry, but be reasonable) with 10 line increments (by default).
High score support - keeps the high score for the current configuration. If the configuration is different in current game than in the one with that high score, it will be set to 0.
Many variables to tweak - as of now, only in a text file. But, the number of variables is another topic in itself!
Theme support - no support for theme per level though, only one for the entire duration.
Music support - in ogg format. Put your music.ogg in your theme folder and enjoy it!

Settings

With the redist, I included a sample configuration file (config.cfg). Most of them are straightforward, but let's check them out anyway. If any of these settings is not present in the file, a default value (hardcoded) will be used instead.

level [1-20] [number1] [number2] [number3] - [1-20] is obviously affected level, number1 is how many frames the game waits for a next drop, number2 means how many lines the block is dropped in one take, number3 is glue delay (in frames, how long the game waits for the block to lock in place after reaching bottom)
DAS [number] - Delayed Auto Shift - how many frames the game waits from pressing a directional button to moving the block automatically.
DAS_speed [number] - how many frames does the game wait until moving the block again after initial DAS delay, ie. with default values: frame 0 - player presses right, block moves right once; frame 11 - still pressed, block moves right again, frame 17 - still pressed, block moves, frame 23 - again...
invisimode [0/1] - toggles rendering of the blocks on the grid. For people who like challenges, you can turn it off.
hold [0/1] - enables HOLD functionality.
ghost_piece [0/1] - enables displaying of the ghost piece.
next_displayed [0-6] - number of NEXT pieces displayed.
line_clear_frms [number] - how many frames line clear animation lasts
level [1-20] - level you start with.
lines_per_lvl [number] - lines the player needs to clear before advancing to the next level.
ars [0/1] - switches between SRS (0) and ARS (1)
are_delay - ARE delay in frames (time between a block locking and spawning the new one)
theme [name] - name of the folder with your theme.

Theme settings

In the theme folder, theme.cfg file contains the configuration of the theme. And by that, I mean positions of the elements. These should be pretty straightforward - texture, then x and y coordinates (0,0 is in top left of the screen, and the coordinates show the top left pixel of the texture) Worth noting are:

offset_next/offset_hold - they set tetrimino position, relatively to the frames
lines_dig_off/level_dig_off - set y position of the digits for level/lines counters, relatively to them

Controls

Finally, how do we play this thing?

D-pad left/right - move the block left/right
D-pad down - soft drop (not limited in speed though, like in Tetris DS! be careful)
D-pad up - hard drop
A - rotate the block clockwise
B - rotate the block counterclockwise
L - hold, if enabled
R - "boost" DAS - the game will act as if both DAS values were halved
START - pause, when gameover - exit
SELECT - no gameover and with START - exit, when gameover - restart the game

Compiling

Just use the attached makefile, but you probably will need sf2dlib and sfillib installed.

To do

Some minor stuff, like more animations, sound effects and a simple menu with configuration